CrossFit Level 1 Training Guide

Key ideas to understand

• CrossFit is defined by five things that are unique both individually and together: its aims, prescription, methodology, implementation, and adaptations.
• AIMS: From the start, the aim has been to forge a broad, general, and inclusive fitness — to prepare people for any physical contingency, 'not only for the unknown but for the unknowable.'
• The aim was reverse-engineered by looking at all sport and physical tasks together and asking which skills and adaptations would most universally improve performance — capacity at the intersection of all sports logically serves all sport. In short: 'our specialty is not specializing.'
• PRESCRIPTION: CrossFit is 'constantly varied, high-intensity functional movement.' That one phrase is the prescription.
• Functional movements are universal motor recruitment patterns; they move in a wave of contraction from core to extremity; and they are compound (multi-joint). They're natural, effective, efficient ways to move your body and outside objects.
• The most important trait of functional movements is their capacity to move large loads over long distances quickly — those three attributes (load, distance, speed) uniquely qualify them to produce high power.
• Intensity is defined exactly as power. And intensity is the independent variable most associated with maximizing the rate of return of favorable adaptation — i.e., results come fastest from intensity.
• The breadth and depth of the program's stimulus determines the breadth and depth of the adaptation — so the prescription is constantly varied, because preparing for random (unknown and unknowable) challenges is at odds with fixed, predictable, routine programs.
• METHODOLOGY: CrossFit's methodology is entirely empirical. Meaningful claims about the three most important, interdependent facets — safety, efficacy, and efficiency — can only be supported by measurable, observable, repeatable data. This is 'evidence-based fitness.'
• The methodology depends on full disclosure of methods, results, and criticisms, delivered through the internet. The charter is open source, turning participating coaches, athletes, and trainers into co-developers through an online community. CrossFit is empirically driven, clinically tested, and community developed.
• IMPLEMENTATION: In practice, CrossFit is a sport — the Sport of Fitness. Harnessing the camaraderie, competition, and fun of sport produces an intensity no other method matches.
• Col. Jeff Cooper's line — 'the fear of sporting failure is worse than the fear of death' — captures it; the observation is that 'men will die for points.'
• The tools of sport — whiteboards as scoreboards, accurate scores and records, a running clock, and precisely defined rules and standards — don't just motivate huge output, they also produce relative and absolute metrics at every workout, and that data has value far beyond motivation.
• ADAPTATIONS: The commitment to evidence-based fitness, public data, collaborative development, and an open-source charter let CrossFit learn precisely what adaptations its programming produces.
• The key discovery: CrossFit increases work capacity across broad time and modal domains. This is treated as a discovery of great importance that now drives the programming.
• This far-reaching rise in work capacity supports the original aim of broad, general, inclusive fitness, and explains CrossFit's success across diverse sports.
• Increased work capacity is seen as the 'Holy Grail' of performance improvement; other common metrics — VO2 max, lactate threshold, body composition, even strength and flexibility — are treated as correlates or derivatives. CrossFit would not trade improvement in any other metric for a decrease in work capacity.
• CONCLUSIONS: Publicly posting daily workouts on the internet (started 2001) grew into a community where human performance is measured and publicly recorded against multiple, diverse, fixed workloads.
• CrossFit is an open-source engine: inputs from anywhere can be publicly given to demonstrate fitness and programming, and coaches, athletes, and trainers collectively advance the art and science of optimizing human performance.

Words to know (plain English)

Aims (of CrossFit)

The goal the whole program is built toward: a broad, general, and inclusive fitness that prepares people for any physical challenge, known or unknowable.

Prescription

CrossFit's one-line formula for what to do: 'constantly varied, high-intensity functional movement.'

Functional movement

A natural, multi-joint (compound) movement that uses universal motor recruitment patterns and fires in a wave from core to extremity — the efficient way to move your body and external objects.

Core-to-extremity

The principle that powerful, functional movement starts at the center of the body (the core) and travels outward to the limbs in a wave of contraction.

Power (intensity)

Work done per unit of time — moving a load over a distance quickly. In CrossFit, intensity is defined exactly as power, and it's the main driver of fast results.

Constant variance

Deliberately changing the workouts so the program never becomes fixed or routine — necessary because you're preparing for unpredictable demands.

Evidence-based (empirical) fitness

Basing claims about a program only on measurable, observable, repeatable data — what can actually be tested and recorded.

Safety, efficacy, efficiency

The three most important and interdependent things to evaluate in any fitness program: is it safe, does it work, and does it get results without wasted effort.

Sport of Fitness

CrossFit implemented as a sport — using scoring, clocks, records, and competition to generate intensity and data that other training methods can't match.

Work capacity across broad time and modal domains

The ability to do work across many different durations (time domains) and many different types of activity (modal domains). CrossFit's central discovery is that it increases this — and it becomes the working definition of fitness.

Open source

An approach where methods, results, and data are fully disclosed publicly so anyone — coaches, athletes, trainers — can contribute and improve the program together.

Key ideas to understand

• CrossFit is core strength and conditioning — not a niche program. The whole point is to build competence across 10 fitness domains at once: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance, and accuracy. Know all 10 cold.
• We chase the broadest possible adaptation. On top of that breadth, the program is distinctive for five things: maximizing neuroendocrine response, developing power, cross-training across modalities, constant practice with functional movements, and a sound diet.
• Three training modalities cover the bases: metabolic conditioning (bike/run/swim/row at short, middle, long distances to hit all three energy systems), gymnastics (bodyweight — builds strength-to-weight ratio plus coordination/balance/agility/accuracy/flexibility), and weightlifting (the Olympic lifts — explosive power and motor recruitment).
• We work compound movements and short, high-intensity cardio instead of isolation movements and long aerobic grinds. Push press replaces the lateral raise, pull-up replaces the curl, squat replaces the leg extension. For every long effort, do five or six short ones.
• 'Is this for me?' Yes — your needs and an Olympic athlete's differ by degree, not kind. Same methods, scaled load. Grandma and the elite skier both need to squat; you just don't load them the same.
• 'Bracketing': CrossFit proved its methods on the sedentary, overweight, pathological, and elderly AND on elite athletes. If it works at both ends of the bracket, it works for everyone in between.
• Sickness–wellness–fitness is one continuum, not three separate things. Blood pressure, cholesterol, heart rate, body fat, muscle mass, flexibility, strength — all run from sick (pathological) to well (normal) to fit (better than normal). CrossFit holds that fitness and health are the same thing.
• 'Core' has two meanings here. One: the fitness we build is foundational to everything else (like a college 'core curriculum' — the stuff everyone needs). Two: the literal center of the body — we train core to extremity, built around extension and flexion of the hips and trunk.
• Powerful hip extension is 'necessary and nearly sufficient' for elite athletic performance. Running, jumping, punching, throwing all start at the core and recruit out to the extremities.
• An hour a day, six days a week is enough for world-class age-group conditioning. The intensity that optimizes conditioning isn't sustainable past 45–60 minutes — past an hour, more is NOT better.
• 'Fringe athletes' — marathoners, triathletes, sumo wrestlers, powerlifters — are so specialized their fitness is lopsided. Endurance athletes especially have trained past any cardiovascular health benefit and given up strength, speed, power. Elite conditioning is a compromise across all 10 skills; specialists don't balance that compromise.
• Three energy systems fuel everything: the phosphagen system and the glycolytic (lactic acid) system are the two anaerobic ones; the oxidative (aerobic) system is the third. Properly structured anaerobic work builds high aerobic fitness WITHOUT the muscle wasting of high-volume aerobic training. All three are always working, but one dominates depending on duration and power output.
• The two Olympic lifts — the clean and jerk and the snatch — are the centerpiece of weightlifting. They teach you to fire more muscle fibers faster, apply force core to extremity, and both DELIVER and RECEIVE force safely. They're the only lifts shown to raise max oxygen uptake.
• 'There is no ideal routine.' The chief value of any routine is abandoning it for another. Whatever a routine leaves out is exactly what you won't adapt to — 'the breadth of adaptation will exactly match the breadth of the stimulus.' So vary constantly.
• Neuroendocrine adaptation = a neurological or hormonal change from training. Heavy loads, short rest, high heart rates, and high intensity drive a big response (more testosterone, IGF, growth hormone); isolation movements drive almost none, which is a big reason they're weak.
• Power = the time rate of doing work — 'hard and fast.' Power IS intensity, and intensity drives nearly every positive fitness result. Increasing power is necessary and nearly sufficient for elite athleticism.
• Cross-training here means more than playing multiple sports — it means training past the normal motions, metabolic pathways, and modes of your sport. Athletes are weakest at the margins of their exposure, so we deliberately expand those margins.
• Functional movements mimic real-life motor recruitment patterns, move multiple joints, are mechanically sound (and therefore safe), and elicit a high neuroendocrine response. Squatting = standing up from a seat; deadlifting = picking anything off the ground. Isolation movements (leg curl, leg extension) have no equivalent in nature.
• The diet prescription: ~30% protein (lean, varied), ~40% carbohydrate (predominantly low-glycemic), ~30% fat (whole-food sources). Set total calories off protein needs — 0.7 g/lb lean body mass for moderate loads up to 1.0 g/lb for hardcore athletes.
• In plain terms: eat meat and vegetables (especially greens), nuts and seeds, some fruit, little starch, no sugar. Shop the perimeter of the store; long shelf life is suspect. This lines up with the Paleolithic/caveman model.
• The nutritional villain is excess high-glycemic carbohydrate. It spikes blood sugar, drives an outsized insulin response, and chronic elevation leads to hyperinsulinism — linked to obesity, high cholesterol, high blood pressure, mood problems, and a Pandora's box of disease.

Words to know (plain English)

Core strength and conditioning

Foundational, general fitness that underlies all athletic needs — the 'stuff everyone needs,' as opposed to sport-specific training. Also refers literally to training the body's center (hips and trunk).

The 10 general physical skills

The full menu of fitness CrossFit develops: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance, and accuracy.

Bracketing

Proving a method works at both extremes of a population (elite athletes and the sedentary/overweight/elderly) so it's trusted to work for everyone in between.

Sickness–wellness–fitness continuum

The idea that health markers run on one scale from pathological (sick) to normal (well) to better-than-normal (fit) — so fitness and health are the same thing measured at different levels.

Core to extremity

The natural order in which sound functional movements recruit muscle — from the center of the body outward to the limbs — and the way we develop athletes.

Hip extension

Opening the hip from a bent to a straight position; the primary power-producing action of the body and 'necessary and nearly sufficient' for elite athleticism.

Fringe athletes

Highly specialized athletes (marathoners, triathletes, sumo wrestlers, powerlifters) whose fitness demands are so narrow they sacrifice broad physical competence.

Three energy systems / metabolic pathways

The phosphagen (phosphocreatine) system and the glycolytic (lactic acid) system — both anaerobic — plus the oxidative (aerobic) system. All three run at once, but one dominates by duration and intensity.

Aerobic vs. anaerobic

Aerobic = energy produced with oxygen, usually efforts longer than ~90 seconds at low-to-moderate power. Anaerobic = energy produced without oxygen, efforts under ~2 minutes at moderate-to-high power.

The Olympic lifts (weightlifting)

The two competition lifts — the clean and jerk and the snatch — prized for developing explosive power, core-to-extremity force, and the ability to receive force safely.

Neuroendocrine adaptation

A training-driven change that affects you neurologically or hormonally (e.g., testosterone, IGF, growth hormone). Heavy load, short rest, high heart rate, and high intensity maximize it.

Power

The time rate of doing work — 'hard and fast.' In CrossFit, power is the definition of intensity and the king of performance.

Cross-training (CrossFit sense)

Training beyond the normal motions, metabolic pathways, and modes of your usual sport — functional, metabolic, and modal cross-training — to cover your weak margins.

Functional movements

Multi-joint, compound movements that mimic real-life motor recruitment patterns (squat, deadlift), are mechanically sound and safe, and elicit a high neuroendocrine response.

Glycemic index

A measure of how quickly a carbohydrate raises blood sugar. High-glycemic carbs (rice, bread, candy, potato, soda, most processed carbs) spike it fastest; processing raises the index.

Hyperinsulinism

Chronically and acutely elevated insulin, driven by excess high-glycemic carbohydrate, linked to obesity, elevated cholesterol and blood pressure, mood dysfunction, and chronic disease.

Paleolithic / caveman model

Eating in line with what our genetics evolved for — meats, vegetables, nuts/seeds, some fruit, minimal starch, no sugar — because modern processed diets outpaced our evolution.

Key ideas to understand

• The whole reason this exists: most authorities won't even define fitness (the NSCA's flagship text doesn't try; the dictionary is no help). CrossFit refuses to champion a program without defining what it delivers, so it built its own definition. This definition is the key to understanding CrossFit's methods and successes.
• CrossFit's view is contrarian: the public holds endurance athletes (like a triathlete) up as the model of fitness. CrossFit does not. The Mark Allen vs. decathlete Simon Poelman example makes the point, an athlete who also has strength, power, speed, and coordination beats the pure endurance athlete in any broad comparison.
• There are FOUR models, used together. Model 1 = the 10 general physical skills. Model 2 = the hopper (performing athletic tasks). Model 3 = the three metabolic pathways (energy systems). Model 4 = the sickness-wellness-fitness continuum (health markers). Each has distinct utility for evaluating an athlete or a program's effectiveness.
• Important caveat: CrossFit isn't claiming scientific proof of legitimacy. It's sharing the methods of a program whose legitimacy was established by the testimony of athletes, soldiers, cops, and others whose lives depend on fitness.
• MODEL 1, the 10 general physical skills: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance, and accuracy. You are as fit as you are competent in all 10, and a program develops fitness to the degree it improves all 10.
• Training vs. practice (a key distinction inside Model 1): endurance, stamina, strength, and flexibility improve through TRAINING (a measurable organic change in the body). Coordination, agility, balance, and accuracy improve through PRACTICE (changes in the nervous system). Power and speed are adaptations of BOTH training and practice.
• Know the 10 definitions cold: Endurance = body systems gather, process, and deliver oxygen. Stamina = process, deliver, store, and utilize energy. Strength = a muscular unit applies force. Flexibility = maximize range of motion at a joint. Power = apply maximum force in minimum time. Speed = minimize the time cycle of a repeated movement. Coordination = combine distinct movement patterns into one. Agility = minimize transition time between movement patterns. Balance = control the center of gravity over the base of support. Accuracy = control movement in a given direction or at a given intensity.
• MODEL 2, the hopper: imagine a hopper holding infinite physical challenges, drawn at random with no selective mechanism. Your fitness is your capacity to perform well at these tasks relative to others. The implication: fitness requires performing well at ALL tasks, even unfamiliar ones and infinitely varied combinations. Practically, this means disinvesting from set notions of reps, rest, exercises, order, routines, periodization, etc. Nature throws unforeseeable challenges, so train broad and constantly varied.
• MODEL 3, the three metabolic pathways (the 'metabolic engines') that power all human action: phosphagen (phosphocreatine), glycolytic (lactate), and oxidative (aerobic). Phosphagen dominates the highest-power efforts under ~10 seconds; glycolytic dominates moderate efforts up to several minutes; oxidative dominates low-power efforts beyond several minutes. Total fitness requires training all three; balancing them is the how and why of CrossFit 'cardio.'
• The two most common faults in fitness training (from Model 3): favoring one or two pathways to the exclusion of the others, and not recognizing the harm of excessive oxidative (aerobic) training.
• MODEL 4, the sickness-wellness-fitness continuum: nearly every measurable marker of health sits on a continuum from sickness to wellness to fitness. Example: blood pressure 160/95 is pathological, 120/70 healthy, 105/55 athletic; 40% body fat pathological, 20% healthy, 10% fit. Same ordering for bone density, triglycerides, muscle mass, flexibility, HDL, resting heart rate, and more. Even mental health fits, depression is mitigated by proper diet and exercise.
• The continuum's punchline: fitness is 'super-wellness.' Sickness, wellness, and fitness are measures of the same entity. Done right, fitness gives a great margin of protection against time and disease. A fitness regimen that does NOT support health is not CrossFit. Studies claiming the fit aren't health-protected almost always studied endurance athletes, often on a dangerous high-carb/low-fat/low-protein fad diet.
• Common ground across the four models: all four exist simply to ensure the broadest, most general fitness possible, full range of adaptations (Model 1), breadth and depth of performance (Model 2), time/power/energy systems (Model 3), and health markers (Model 4). The fitness is deliberately broad, general, and inclusive. CrossFit's specialty is not specializing; combat, survival, sport, and life reward this and punish the specialist.
• IMPLEMENTATION, you forge this fitness by molding athletes who are equal parts gymnast, Olympic weightlifter, and multi-modal sprinter. Develop the capacity of a novice 800m runner, gymnast, and weightlifter and you'll be fitter than any world-class specialist in any one of them. The tools are metabolic conditioning ('cardio'), gymnastics, and weightlifting.
• Metabolic conditioning / 'cardio': of the three pathways, phosphagen and glycolytic are anaerobic; oxidative is aerobic. Aerobic training helps cardiovascular function and lowers body fat, BUT too much aerobic work decreases muscle mass, strength, speed, and power, and reduces anaerobic capacity. Anaerobic training ALSO helps cardiovascular function and is actually superior for fat loss, and it uniquely improves power, speed, strength, and muscle mass without harming aerobic capacity.
• Interval training is the key to building the cardiovascular system without losing strength, speed, and power. It mixes timed bouts of work and rest; varying work duration, rest duration, and number of intervals controls which pathway you condition. The Tabata interval (20 sec work / 10 sec rest x 8) is a regular example shown to boost both anaerobic and aerobic capacity. Interval guidelines: phosphagen ~10-30s work / 30-90s rest (1:3) x 25-30; glycolytic ~30-120s work / 60-240s rest (1:2) x 10-20; oxidative ~120-300s work / 120-300s rest (1:1) x 3-5.
• Dr. Seiler's work backs the interval reliance: there are three waves of adaptation to endurance training, increased max oxygen consumption (wave 1), increased lactate threshold (wave 2), increased efficiency (wave 3). CrossFit maximizes wave 1, gets wave 2 systemically through many modalities, and deliberately avoids wave 3 efficiency, since waves 2 and 3 are highly specific and can hurt broad fitness.
• Gymnastics (broadly defined, climbing, yoga, calisthenics, dance, anything where the aim is body control) develops strength (especially upper body and trunk), flexibility, coordination, balance, agility, and accuracy. Start with the calisthenics core: pull-ups, push-ups, dips, rope climbs (with benchmark goals). At 15 pull-ups and dips, start the muscle-up. Develop the handstand, then pirouettes, handstand walking, and handstand presses; build trunk strength with sit-ups and the L-hold.
• Weightlifting (the Olympic sport, clean and jerk and snatch) develops strength (especially hips), speed, power, flexibility, coordination, agility, accuracy, and balance like no other modality. The Olympic lifts are based on the deadlift, clean, squat, and jerk, which should be the core of resistance training because they elicit a profound neuroendocrine response (they change you hormonally and neurologically). Isolation/bodybuilding moves (curls, leg extensions, flyes) have a blunted neuroendocrine response, no functional analog, and work one joint at a time, so they have no place in serious strength and conditioning.
• Throwing (medicine-ball work, especially the Dynamax ball) adds a potent stimulus for strength, power, speed, coordination, agility, balance, and accuracy, plus general movement practice.
• Nutrition can amplify or diminish your training. Effective nutrition is moderate in protein, carbohydrate, and fat (roughly 40% carb / 30% protein / 30% fat), NOT the high-carb/low-fat/low-protein fad. The Zone Diet offers the greatest precision and health benefit. Forget the fad diet.
• Sport is the application of fitness in an atmosphere of competition and mastery. Sport is better at EXPRESSING and testing the 10 skills than at developing them; training develops them faster but with more predictable movements. Both expression and development matter, so athletes should play sports on top of their strength and conditioning.
• The theoretical hierarchy of athlete development (a pyramid): nutrition at the base, then metabolic conditioning, gymnastics, weightlifting, and sport at the top. It reflects foundational dependence and skill ordering, from molecular foundations up to mastery and application. A deficiency at any level makes everything above it suffer. Its best use is diagnosing an athlete's shortcomings.
• Integration: every routine contains a blueprint for its own deficiency. Work only low reps and you miss localized muscular endurance; only high reps and you miss strength and power. For the broad fitness CrossFit seeks, modulate every parameter you control, routine is the enemy of progress. The body only responds to an unaccustomed stressor; strive for variance.
• Scalability and applicability: the needs of an Olympic athlete and your grandparents differ by DEGREE, not KIND, one wants functional dominance, the other functional competence, but both manifest through identical physiological mechanisms. CrossFit scales load and intensity; it does not change the program. The same routines serve elderly heart-disease patients and cage fighters. Sport-specific training is mostly ineffective; specificity is met by practicing the sport itself, not in the strength and conditioning environment.

Words to know (plain English)

The four models of fitness

CrossFit's combined definition of fitness: the 10 general physical skills, the hopper, the three metabolic pathways, and the sickness-wellness-fitness continuum.

10 general physical skills

Cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, coordination, agility, balance, and accuracy; you're as fit as you're competent in all 10.

Training vs. practice

Training improves performance through a measurable organic change in the body (endurance, stamina, strength, flexibility); practice improves it through nervous-system changes (coordination, agility, balance, accuracy). Power and speed need both.

The hopper

A thought model: an infinite hopper of random physical challenges. Fitness is your ability to perform well at any task drawn from it, even unfamiliar ones.

Phosphagen pathway

The anaerobic 'phosphocreatine' energy engine that dominates the highest-power efforts lasting under about 10 seconds.

Glycolytic pathway

The anaerobic 'lactate' energy engine that dominates moderate-power efforts lasting up to a few minutes.

Oxidative pathway

The aerobic energy engine that dominates low-power efforts lasting beyond a few minutes; over-training it is a common fault.

Sickness-wellness-fitness continuum

The idea that health markers (blood pressure, body fat, HDL, etc.) fall on one continuum, and fitness is 'super-wellness,' the far healthy end.

Interval training

Mixing timed bouts of work and rest; adjusting work/rest duration and repetitions targets a specific metabolic pathway and builds cardio without losing strength, speed, or power.

Tabata interval

20 seconds of work followed by 10 seconds of rest, repeated eight times; shown to boost both anaerobic and aerobic capacity.

Neuroendocrine response

Hormonal and neurological change from exercise. Functional, multi-joint lifts (deadlift, clean, squat, jerk) produce a profound one; isolation moves produce a blunted one.

Theoretical hierarchy of development

The athlete-development pyramid: nutrition, then metabolic conditioning, gymnastics, weightlifting, and sport, where a deficiency at any level weakens everything above it.

Differ by degree, not kind

An Olympic athlete (functional dominance) and a grandparent (functional competence) need the same kind of training through identical physiology; you scale load and intensity, not the program.

Key ideas to understand

• This starts with 'a belief in fitness' — that there's a physical capacity that serves you generally well in any contingency: the likely and unlikely, the known and unknown. That's different from sport fitness, where we already know the event's physiological demands.
• When CrossFit went to the literature for a definition of fitness, what existed was esoteric, irrelevant, or logically/scientifically flawed. The key test: even bodies like the ACSM give definitions that contain nothing measurable — and if it isn't measurable, it isn't a valid definition.
• So CrossFit built three clumsy-but-useful operational models that kept it pointed at this broad fitness, and later added a fourth.
• MODEL 1 — the 10 general physical skills (from Cawley and Evans of Dynamax): cardiorespiratory endurance, stamina, strength, flexibility, power, speed, coordination, accuracy, agility, balance. You are as fit as you are developed in breadth and depth across all 10; a deficiency in any one relative to a cohort makes you less fit. These distinctions are manmade abstractions — nature isn't obligated to recognize them — but they help us understand fitness.
• MODEL 2 — the hopper: a statistical model based on training modality. Load a lottery-style hopper with every skill and drill from every sport and regimen imaginable (track agility, a football bench-press max, Fran/Helen/Diane, Pilates, yoga). Pull tasks at random and test everyone. Whoever performs best at randomly assigned tasks is the fittest.
• A key hopper insight: the fittest person might be only 75th percentile at each event. Being BEST at many things actually tells you you're NOT as fit as you could be. A 4-minute mile, for example, comes packaged with a roughly half-bodyweight bench and a 3-4 inch vertical — that's a narrow, specialized bandwidth, not advancing fitness. No value judgment, just physiology.
• The biggest payoff is in the event you do NOT want to see come out of the hopper — that's your chink in the armor, a glaring deficiency in your general physical preparedness (GPP). Fixing it gives advantage in places that don't always make obvious mechanical or metabolic sense.
• There's more opportunity to advance athletic performance by raising GPP than by adding sport-specific work. Example: more pull-ups make for better skiers, and we don't need to know the exact mechanism — we're focused on advancing performance.
• MODEL 3 — the three metabolic pathways (the three engines that make ATP, the currency of all effort), plotted as power on the Y-axis and duration on the X-axis: (1) phosphagen/phosphocreatine — high power, short duration, ~100% of max output, taps out around 10 seconds; (2) glycolytic/lactate — moderate power, moderate duration, ~70% of max, peaks around 60 seconds, ends around 120; (3) oxidative/aerobic — low power, long duration, ~40% of max, doesn't fade in any reasonable time. Phosphagen and glycolytic are anaerobic; oxidative is aerobic.
• All three engines run all the time to some degree; how active each is depends on the activity. You're as fit as you're balanced across all three — a human is a vehicle with three engines, and we build all of them with constantly varied functional movement at high intensity (a balance in bioenergetics).
• THE 2002-2008 DEFINITION came from collecting WOD data and asking what it really means when your Fran time drops from 7 to 6 to 5 to 4 minutes.
• The work to do a benchmark like Fran is CONSTANT (force times distance) — it only changes if your height, the range of motion, the load, or your bodyweight change. So every time you repeat the workout, the work is the same.
• Power = force x distance (work) / time. Do Fran at Time 1, then a year later at Time 2: the constant work cancels, and the difference in time IS the difference in power. That ratio (T2/T1) describes your progress to the precision of the stopwatch — your most accurate tool, more so than the tape measure or scale.
• Because the same measurement error happens on every effort and cancels out in comparison (zero-order error), tracking the change in time between attempts is really tracking change in power. Your collection of workout data points is your work capacity across broad time and modal domains — THAT is your fitness.
• Graph it: plot average power output for efforts of ~10 sec, 30 sec, 2 min, 10 min, 60 min, etc. With scientific accuracy and precision, the result is a curve — your work capacity across broad time and modal domains (Figure 1). Fitness is the area under that curve.
• MODEL 4 and HEALTH (2008): along the way they saw a continuum from sickness to wellness to fitness. Any quantifiable metric a physician or physiologist cares about sits well-ordered on this pattern — body fat (40% morbidly obese, ~15% normal, ~5% elite), bone density (osteoporosis → normal → 3-5x normal in gymnasts), resting heart rate, flexibility, even mood. No known metric runs counter to it.
• That means fitness and health are different measures of the same reality — and if you're fit, you'd first have to become merely well before you could become pathologically sick. Fitness is a hedge against sickness, with wellness as the intermediate value. If any lifestyle, training, or recreational metric is moving the wrong way, entertain that you're doing something profoundly wrong.
• When you do CrossFit, eat meat and vegetables/nuts and seeds/some fruit/little starch/no sugar, and sleep plenty, you don't get the divergent side effect where everything improves except one value — so this observation itself becomes a test of your regimen.
• Add a third axis — age (Z-axis) — and extend fitness across your lifetime, and the area-under-the-curve becomes a three-dimensional solid (Figure 2). That solid IS health. Health is maximized by maximizing your area under the curve and holding that work capacity for as long as you can.
• These definitions differ from exercise science in two ways: first, they're MEASURABLE (exercise science rarely meets the rigor of chemistry, physics, or engineering); second, it's almost never really about exercise — VO2 max and lactate threshold are correlates or components but are subordinate to work capacity. Nobody trades work capacity for a higher VO2 max.
• No one has ever built a great athlete by advancing isolated metrics one at a time. You move them best by doing constantly varied, high-intensity functional movement — turning fitness into sport with fixed workloads and minimized times in a competitive cohort — and then those metrics do spectacular things.
• Longevity alone isn't the goal: a 90-year-old running stairs and playing with grandkids matters more than 'good cholesterol,' and a long life with very low work capacity is not what CrossFit is about. It's about vitality and capacity — what can you DO?
• Bottom line for making meaningful training assertions: fitness and health must be measurable. Area (or volume) under the curve gives a scientifically accurate, precise, valid measure — and that's assessed the same way you'd assess a rocket, motorcycle, or truck: how much it weighs, how far it moves, how long it takes. Everything else is irrelevant.

Words to know (plain English)

Fitness (CrossFit's definition)

Work capacity across broad time and modal domains — measured as the area under a curve of power output plotted against duration of effort. The more capacity across more time frames and more kinds of movement, the fitter you are.

Health (CrossFit's definition)

That same work capacity held across your entire lifespan — fitness with age added as a third dimension, forming a 3-D solid. Maximized by maximizing the area under the curve and holding it as long as possible.

10 general physical skills

Model 1: cardiorespiratory endurance, stamina, strength, flexibility, power, speed, coordination, accuracy, agility, and balance. You're as fit as you're developed across all ten, in breadth and depth.

The hopper

Model 2, a statistical model: a lottery-style drum loaded with every skill and drill from every sport and regimen. Pull tasks at random; the fittest person performs best across randomly assigned tasks.

General physical preparedness (GPP)

Your broad, all-around physical readiness. CrossFit argues raising GPP advances performance more than sport-specific training — and your worst hopper event marks the biggest GPP gap to attack.

Metabolic pathways (the three engines)

Model 3, the three systems that make ATP: phosphagen (high power, ~10 sec), glycolytic/lactate (moderate power, ~60-120 sec), and oxidative/aerobic (low power, long duration). Phosphagen and glycolytic are anaerobic; oxidative is aerobic. Fitness is balance across all three.

ATP (adenosine triphosphate)

The body's energy currency — the molecule the three metabolic pathways produce to fuel all effort.

Work and power

Work = force x distance. Power = work / time. Because a benchmark's work is constant when you repeat it, a faster time directly means more power.

Zero-order error

When the same measurement error occurs on every effort, it cancels out when you compare one effort to another — so the ratio of times is accurate to the precision of the stopwatch.

Sickness-wellness-fitness continuum

The observation that nearly every health metric (body fat, bone density, resting heart rate, etc.) lines up in order from sickness through wellness to fitness — evidence that health and fitness are the same reality measured differently.

VO2 max / lactate threshold

Common exercise-science metrics. CrossFit treats them as correlates or components of fitness but subordinate to work capacity — nobody would trade work capacity for a better VO2 max.

Key ideas to understand

• Behind the whole program is the quantification of fitness: putting a number on fitness as work capacity across broad time and modal domains. You can assess someone's fitness by the area under their work-capacity curve, imagine ranking athletes across 25-30 varied workouts (from short rower efforts to a 10-mile run) and compiling their overall placings for a real metric of total capacity.
• This sits inside a bigger idea: evidence-based fitness, using measurable, observable, repeatable data to analyze and assess a program. There are three meaningful components to that analysis: safety, efficacy, and efficiency.
• Efficacy means 'What is the return?', the tangible result, the adaptation the program actually induces. For CrossFit, the efficacy is increased work capacity across broad time and modal domains. If a program claims it makes you a better soccer player, there must be measurable evidence.
• Efficiency is the time rate of that adaptation, how fast the result comes. Delivering 50 pull-ups in six months versus nine years is a huge difference in efficiency.
• Safety is how many people end up at the finish line. A program that turns 2 of 10 people into the fittest on Earth while the other 8 die is not something you can judge without knowing the safety numbers, and the real tragedy is not knowing them.
• Safety, efficacy, and efficiency point in the same direction and aren't fully at odds. You can crank safety up by turning efficacy and efficiency to zero; you can boost efficiency by turning intensity up and risking safety; you can wreck efficacy by losing people. Together, these three vectors give you everything you need to assess a program.
• Choosing work capacity as the standard for efficacy forces the qualification of movement, that is, judging HOW you move, not just how much output you produce.
• Four common terms qualify movement: mechanics, technique, form, and style. The exact distinctions don't matter much, and technique and form get used somewhat interchangeably.
• Mechanics is the physics of movement: angular velocity, momentum, leverage, muscle origin/insertion, torque, force, power, relative angles, mostly the statics, less the dynamics.
• Technique is the method for completing a movement, the macro 'how do you complete the movement' without the physics (e.g., for a twisting ring dismount: pull, let go, look, arm up, turn, shoulder drop). It includes head and body posture, and some techniques are more effective than others.
• Form is the normative value, the 'good/bad,' 'should/shouldn't' judgment applied to mechanics and technique.
• Style is the signature unique to you, like a thumbprint (a coach can spot a lifter by bar path). To be pure style, it has no bearing on form, technique, or mechanics, and doesn't change the physics.
• By taking power (work capacity) as the primary value and relying on functional movement, you land in an interesting position: power becomes the successful completion of functional movement.
• This is NOT about energy merely exerted. Plot work completed against energy expended: someone can burn a lot of energy and do little work by being inefficient. The ideal is little energy spent for maximum work. Technique is what maximizes the work completed for the energy expended. For any given metabolic capacity, the person who knows the technique does the most work.
• Concrete example: take two people loading a truck with sandbags, one knows how to lift and transport large objects, one doesn't. The skilled one does far more work for the same energy.
• CrossFit does NOT take contractile potential as the gold standard for strength. Strength is the productive application of force. Huge biceps and quads are useless if you can't run, jump, lift, throw, or press. If strength can't be expressed as power, as a productive result, it doesn't count.
• Technique ties directly to safety, efficacy, and efficiency. Safety: two people lift a heavy object, one pops the hip and gets under it (clean), one pulls with a rounded back, you can guess who gets hurt. Efficacy: for any given contractile potential or metabolic limit, the one with good technique gets more work done and develops faster. If your clean still looks wrong after six months, you won't hit twice-bodyweight overhead as fast as someone who looks natural.
• Across domains where speed matters, technique is at the heart of it: typing, shooting, violin, NASCAR, CrossFit. In all of them, marked proficiency shows up as speed. A flawless typist at 20 words a minute on two fingers won't get hired; a 12-minute 'Flight of the Bumblebee' isn't virtuosity; a perfectly exquisite Fran that takes 32 minutes is worthless.
• The false choice: coaches get asked 'good form OR do it quickly?' Both are impossible without the other, technique and speed only seem at odds. It's a misapprehension, an illusion.
• You learn to go fast by going fast, making lots of errors, and then pulling the errors back in at that speed, then going faster and pulling them back in again. A race driver who's never spun out isn't very good; a typist who's never made a mistake is very slow; in CrossFit, if your technique is always perfect, your intensity is always low.
• The hard part to understand: you won't maximize intensity/speed without mistakes, BUT it's not the mistakes that make you faster. Hitting the wrong note or missing the target didn't make you better, the errors are just an unavoidable consequence of development.
• This iterative process, letting the scope of errors broaden, then reducing them WITHOUT reducing the speed, is called threshold training.
• How it works in a workout: if you're moving well, the coach tells you to pick up speed; if it still looks good, go faster; eventually the movement starts to fall apart. The coach does NOT want you to slow down yet, first, at that speed, fix the technique. You continuously advance the margin at which form falters (e.g., perfect at 10,000 ft-lb/min but breaking at 12,000; work that 10,000-12,000 zone to clean it up, then push to 14,000, and repeat). The process is ineluctable, unavoidable.
• CrossFit is 'the technique people', drill technique incessantly while simultaneously pushing for more speed. You only learn to work at high intensity with good technique by ratcheting intensity to the point where good technique is momentarily impossible. At the limits of your capacity, you can't obey every nuance of technique, and some refined motor-recruitment patterns won't always look perfect.
• There's no domain where speed matters and technique isn't central. If someone set a record with poor technique, it means either better technique would've gone farther, or we were wrong about what good technique is. Technique is everything, you won't express power in significant measure without it, won't see productive force, won't complete tasks efficiently, and won't be safe trying.
• The order is the key to implementation: learn the Mechanics of fundamental movements, build a Consistent pattern of practicing them, and only then ratchet up Intensity. Mechanics, then Consistency, then Intensity.

Words to know (plain English)

Work capacity across broad time and modal domains

CrossFit's measurable definition of fitness: the ability to do work across many durations and many kinds of activity.

Evidence-based fitness

Analyzing and assessing a program using measurable, observable, repeatable data rather than opinion.

Efficacy

The return on a program, the actual adaptation or result it produces (for CrossFit, increased work capacity).

Efficiency

The time rate of adaptation, how quickly the program delivers the result.

Safety

How many people make it to the finish line; a program is incomplete without knowing its safety numbers.

Mechanics

The physics of a movement, leverage, torque, force, momentum, relative angles.

Technique

The method for completing a movement, the macro 'how,' including posture, without reducing it to the physics.

Form

The normative judgment ('good/bad,' 'should/shouldn't') applied to mechanics and technique.

Style

The signature unique to an athlete that doesn't affect form, technique, or the physics, like a thumbprint on the movement.

Strength (CrossFit definition)

The productive application of force, force that produces real work/power, not just contractile potential.

Threshold training

Pushing intensity until errors appear, then cleaning up technique at that speed without slowing down, then repeating at a higher speed.

Mechanics, Consistency, Intensity

The required order for safely and effectively implementing CrossFit: learn sound mechanics, make them consistent, then add intensity.

Power

Here, the successful completion of functional movement, the productive expression of strength as work over time.

Key ideas to understand

• Norman Kaplan's July 1989 Archives of Internal Medicine paper (still unchallenged) showed — by mechanism, by correlation, and causally — that hyperinsulinism (too much insulin) is the root of the 'deadly quartet': upper-body obesity, glucose intolerance, hypertriglyceridemia, and hypertension.
• Insulin is normal and essential — a hormone from the pancreas that you can't live without; it stores energy in cells (including storing fat). You either produce it, inject it, or die. Glucagon is its counter-regulatory partner — it releases energy out of cells.
• The way you get insulin too high (hyperinsulinism) is eating too much carbohydrate. 'Too much' is qualitative: if your insulin is driving up blood pressure, making you fat, or hurting your ability to clear blood sugar after eating, you're getting too much insulin — and therefore too much carb. Glucose intolerance, hypertension, and high triglycerides are the tells.
• These are risk factors for heart disease and the process that builds atherosclerotic disease — arteries paved over with plaque — leading to thrombosis, occlusion, myocardial infarction, debilitation, and death.
• When physicians are asked what they least want to get, Type 2 diabetes ranks higher than cancer or heart disease.
• Type 2 diabetes is caused by a receptor downgrade phenomenon on the liver, muscle, and fat cells. Insulin binds to a receptor like a key in a lock; when the cell binds insulin, it can take in good things including amino acids (protein) and fat.
• Expose yourself to too much insulin and the receptors go 'blind' — the key stops working in the lock (receptor downgrade). It's like staring at the sun: at first you see light, but burn out the receptors and you won't see light again. That's Type 2 diabetes.
• Kaplan's work overturned the accepted model. The old story said people first got fat, then high cholesterol (hypercholesterolemia), then high blood pressure, then diabetic — and assumed the order proved causation. That's the post hoc, ergo propter hoc fallacy: order of events does NOT prove causality. Kaplan showed hyperinsulinism was the actual cause of all of it, of atherosclerotic disease, and of cardiac death — collectively coronary heart disease (CHD).
• The big shift: heart disease is driven not by dietary fat but by excessive carbohydrate. The 'French paradox' is no paradox — the French eat many times the fat Americans do, have far less heart disease, and eat just under 5% of the refined sugar we do. Americans eat about 150 lb. of sugar per person per year.
• The craving for carbohydrate is no different than an interest in beer or opiates — sugar tickles the brain and feels good, and people make wild excuses to get the high.
• The prescription to avoid all of it: eat a diet of meat and vegetables, nuts and seeds, some fruit, little starch, and no sugar. Do that and you're exempt — no coronary heart disease.
• It's not about genetics in the way people think. The genetic piece is an intolerance to excess carbohydrate — like a predisposition to alcoholism. Having the gene doesn't mean it expresses; you'd have to drink. Don't eat the carbs your relatives ate and you don't get their disease (the Dr. Barry Sears example: his father and uncles all died at 49 from atherosclerotic thrombosis — he won't, because he isn't eating their carbohydrates).
• Four practical food rules to reach the same endpoint: (1) if you couldn't have harvested it from a garden/farm and eaten it an hour later, it's not food; (2) shop the perimeter of the grocery store, not the aisles; (3) if it has a food label, it's not food (no label on chicken or tomatoes — labels are on chips and cookies); (4) if it's not perishable ('Best if used before 2019'), it's not food.
• Back in 1995 the same lecture got disbelief ('Fat makes you fat, right?'). It's not true.
• OPTIMIZING PERFORMANCE is the next layer. The meat-and-vegetables prescription alone won't optimize your OUTPUT — to get a sub-three-minute Fran you have to weigh and measure your meat, vegetables, nuts, seeds, fruit, and starch and eliminate sugar.
• Top-fuel performance needs top fuel. Glassman has worked with tens of thousands of people and has never seen anything but inferior capacity on a diet where people didn't weigh and measure.
• You don't have to weigh and measure forever — but at least to start, and it's good to go back to it occasionally. Without it, portions drift: you under-eat the foods you dislike and over-eat the ones you love ('one spear of asparagus... a pound of ice cream'), biasing the wrong way.
• Take any group, get one person to weigh and measure, and that person pulls away. There's a one-to-one correspondence between elite CrossFit performance and the accuracy/precision of consumption — short of doing more pull-ups, almost nothing gets you more pull-ups like eating this way.
• At some point you may need to STOP an athlete from leaning out further — it's possible to get too lean to perform. If output plateaus: when the athlete is as lean as desired and before performance drops, DOUBLE the fat. If they don't feel a lot better, try three times the fat. If that just makes them thicker, go back to two times. Let performance dictate the change. (Same logic raises intake for hard gainers.) There's more room to play with someone who has padding; be more careful with someone already ripped.
• The only inputs that matter for the prescription are lean body mass and activity level. There's no inherent difference for men vs. women or young vs. old — everything else is extraneous.
• Everyday life (schedules, appetite) creates intake fluctuations without weighing and measuring — that's the coarse path. The fine path required for optimized performance is why you won't get there by luck. An average athlete can become extraordinary this way; commitment and focus overcome genetic limitations, all in this 40-30-30 milieu of macronutrient intake.

Words to know (plain English)

Hyperinsulinism

Chronically too much insulin in the blood — the root cause (per Kaplan) of the deadly quartet, atherosclerosis, and cardiac death; driven by eating too much carbohydrate.

Insulin

A pancreatic hormone that stores energy (including fat) inside cells. Essential to life, but excess drives chronic disease.

Glucagon

Insulin's counter-regulatory hormone — it releases stored energy back out of cells.

Deadly quartet

The four conditions Kaplan tied to hyperinsulinism: upper-body obesity, glucose intolerance, hypertriglyceridemia (high blood triglycerides), and hypertension (high blood pressure).

Receptor downgrade phenomenon

When chronic excess insulin makes the receptors on liver, muscle, and fat cells go 'blind' to it (the key stops working in the lock) — the mechanism of Type 2 diabetes.

Type 2 diabetes

Disease caused by receptor downgrade on liver, muscle, and fat cells from too much insulin; ranked by physicians as the condition they least want to get.

Atherosclerotic disease

Arteries 'paved over' with plaque, leading to thrombosis, occlusion, heart attack, and death; collectively (with cardiac death) called coronary heart disease (CHD).

Post hoc, ergo propter hoc fallacy

The logical error of assuming that because one thing happened before another, the first caused the second; the flaw in the old fat→cholesterol→hypertension→diabetes model.

French paradox

The observation that the French eat far more fat than Americans yet have far less heart disease — not actually a paradox; it reflects that carbohydrate (and ~20x less refined sugar), not fat, drives heart disease.

Lean body mass

Body weight minus fat — one of the only two inputs (with activity level) that determine the nutrition prescription.

Weigh and measure

Precisely portioning food to optimize performance; not required forever, but the practice that separates elite output from coarse, drifting intake.

40-30-30 (Zone ratio)

The macronutrient milieu (≈40% carbohydrate, 30% protein, 30% fat by block balance) within which precise eating produces optimized performance.

Key ideas to understand

• In 2002 CrossFit observed that almost any health marker sits well-ordered on a continuum from sick to well to fit. Examples: HDL cholesterol — under 35 mg/dL is a problem, 50 is nice, 75 is a lot better; blood pressure — 195/115 is a problem, 120/70 is healthy, 105/50 looks athletic. Triglycerides, bone density, muscle mass, body fat, and HbA1c all plot the same way.
• These markers are the predictors, the cause, AND the manifestation of chronic disease — they're the same measures across the board.
• Chronic diseases include obesity, coronary heart disease, Type 2 diabetes, stroke, cancer (breast, colon, lung — and Glassman's theory is eventually all PET-positive cancers, ~95% of all cancers), Alzheimer's, peripheral artery disease, advanced biological aging, and drug addiction, among others.
• If you have any chronic disease, you very likely have deranged markers — e.g., with Alzheimer's you'd see suppressed HDL, elevated blood pressure, elevated triglycerides, high body fat, low muscle mass, low bone density, high HbA1c. The same pattern holds for diabetes and most cancers.
• Medicine has NO effective treatment for chronic disease — it's symptomatic only. Drugs lower cholesterol, raise bone density; bariatric surgery, bypass surgery, insulin — none of these are fixes, they mask the problem. (If you have persistent malignant hypertension you should take an antihypertensive if you can't get pressure down otherwise — but 'how would you get it down otherwise?')
• CrossFit holds a uniquely elegant solution to the greatest problem facing the world — not climate change, not politics: chronic disease. The CrossFit stimulus (constantly varied, high-intensity functional movement + meat and vegetables, nuts and seeds, some fruit, little starch, no sugar) can give you a pass on chronic disease. It's elegant in the mathematical sense — simple and effective.
• Seventy percent of U.S. deaths are attributable to chronic disease — of 2.6 million deaths in 2014, 1.8 million were chronic. The pattern holds even in countries ravaged by infectious disease, and adding PET-positive cancers could push it to 80-85%. The CDC estimates the U.S. could have up to 100 million diabetics by 2050 — you'd see heart attacks on every corner. Medicine has no solution; you do.
• The other 30% die from accidents in four '-ic' variants: kinetic (physical trauma — car crash, bike hit), toxic (environmental toxins like lead), genetic (disorders like cystic fibrosis you're born with), and microbic (virus, bacteria, prions). THIS is where medicine's miracles live and treatment can be symptomatic.
• Doctors are like lifeguards; CrossFit trainers are like swim coaches. When you're drowning you don't need a swim coach — you need a lifeguard. Trainers teach people to swim; when they don't pay attention and go under, doctors take care of it.
• Accidents are largely beyond your control — except for one thing: be fit. Fitter people survive kinetic trauma, toxic exposure, and microbic threats better, and some genes only express based on diet and exercise behavior. (Who's most vulnerable to viral pneumonia? The frail and feeble.)
• But even assuming fitness offers no protection from accidents, what prevents accidents is largely LUCK — and there's no 'good' vs. 'bad' luck, just whether these things happen to you. So get fit and don't waste time worrying about germs, tires through the windshield, toxic air, or your genes — worry won't make you happier, better, safer, or longer-lived.
• This is the 'kinetic theory of health': a singular focus on kinematics — increasing work capacity, increasing fitness — is how you avoid chronic disease. Get a better Fran, a better deadlift, a better Diane time, and do what supports that: eat meat and vegetables, nuts and seeds, some fruit, little starch, no sugar; get plenty of sleep; maybe take some fish oil. After that, there's nothing else that matters.
• The magic formula: Fitness + Luck (bad) = Health. The part you CAN do something about (fitness) plus the part you CAN'T (luck) sums to your outcome — so maximize fitness and you won't be one of the seven in ten who die unnecessarily from lifestyle. Chronic disease is a deficiency syndrome: sedentation with malnutrition.
• The cost: U.S. medical expenditure is ~$4 trillion/year. A 2008 PricewaterhouseCoopers estimate said roughly half of U.S. medical spending was wasted (unnecessary procedures, administrative inefficiency, treating preventable conditions); with fraud and abuse, well over a trillion wasted. About 86% of overall health-care spending goes to treating the chronically diseased ineffectively; of the remaining 14%, half goes to what medicine can actually fix — so only ~7% of spending isn't wasted.
• CrossFit trainers provide non-medical health care; doctors treating the accident 30% provide medical health care. The easy way to tell them apart is by methods and tools: cut open, irradiated, prescribed pills, injected with syringes = medicine, a doctor's work. Rings, dumbbells, pull-up bars, our own bodies = CrossFit.
• The prescription is UNIVERSAL — it doesn't matter where you fall on the continuum, everyone gets the same program. If the prescription is universal, it can't be medicine. Like air, oxygen, or vitamin C (without which you get scurvy), it's something everyone needs. Physicians shouldn't control orange and kale production because those have vitamin C — and we can't let exercise fall under that kind of control either. There's a well-funded movement to pull exercise into the medical arena so it falls under the Affordable Care Act.
• There are ~13,000 gyms with 2-4 million people safe from chronic disease right now. But the gyms thrive not because of their impact on chronic disease — they thrive because the customers are extremely happy with the transformation, which is part physical, part emotional, part health markers, part relationships. That's the miracle of CrossFit: people get something they didn't even know they wanted or needed.

Words to know (plain English)

Sickness-wellness-fitness continuum

The single ordered scale (sick → well → fit) on which virtually every health marker plots; the further toward 'fit,' the further from chronic disease.

Chronic disease

Lifestyle-driven diseases (obesity, CHD, Type 2 diabetes, stroke, most cancers, Alzheimer's, etc.) that medicine can only treat symptomatically; described as a deficiency syndrome of sedentation plus malnutrition.

Deficiency syndrome (sedentation with malnutrition)

Glassman's framing of chronic disease as a deficiency of activity (sedentation) and good nutrition — which is why the fix is fitness, not medication.

CrossFit stimulus

Constantly varied, high-intensity functional movement combined with the diet (meat and vegetables, nuts and seeds, some fruit, little starch, no sugar) — the dose that gives a pass on chronic disease.

Non-medical health care

What CrossFit trainers provide — improving health via exercise and diet (rings, bars, bodyweight) rather than the doctor's tools (surgery, radiation, pills, syringes).

The four '-ic' accident variants

The non-chronic ~30% of deaths: kinetic (physical trauma), toxic (environmental toxins), genetic (born-with disorders), and microbic (viruses, bacteria, prions) — the domain where medicine's miracles apply.

Kinetic theory of health

The idea that a singular focus on kinematics — increasing work capacity/fitness — is how to avoid chronic disease.

HbA1c (glycated hemoglobin)

A blood marker reflecting average blood sugar over time; one of the markers that plots on the sickness-wellness-fitness continuum.

HDL cholesterol

High-density lipoprotein; a health marker where higher is better (≈35 = problem, 50 = nice, 75 = much better) and which plots on the continuum.

Fitness + Luck (bad) = Health

Glassman's formula: your health outcome is the part you control (fitness) plus the part you can't (luck/accidents) — so maximize fitness and stop worrying about luck.

Key ideas to understand

• CrossFit's position: Dr. Barry Sears' Zone Diet closely models optimal nutrition, and CrossFit's best performers are Zone eaters. When second-tier athletes go strict on the Zone, they tend to jump to top-tier fast — the Zone accelerates and amplifies the effects of training.
• The catch: most of the Zone's benefit only shows up for people who, at least at first, weigh and measure their food. CrossFit spent a decade trying scale-free portioning and concluded the natural variance in calories and macros without measuring is bigger than the resolution it takes to turn good performance into great.
• So the recommendation is blunt: weigh and measure your portions for a couple of weeks — not because it's fun, because it's worth it. Guesstimate instead, and you'll only get CrossFit's top-performer results if and when you get lucky.
• The payoff of those two weeks: you build an uncanny ability to eyeball common portions AND, more importantly, a keen visual sense of your own nutritional needs. That awareness is the real prize.
• The whole scheme is built on the BLOCK — a unit of measure that simplifies building balanced meals. One block of protein = 7 g protein, one block of carbohydrate = 9 g carbohydrate, one block of fat = 3 g fat.
• Key fat wrinkle: because most protein sources already carry fat (meat, for example), when you're building a meal you only add 1.5 g of fat per fat block from your fat list. The block chart tells you the amount of each item that hits that 1.5 g.
• When a meal is equal blocks of protein, carb, and fat, the calories come out to 40% carbohydrate, 30% protein, 30% fat. That 40/30/30 split is the signature of the Zone.
• Everybody lands on 2-, 3-, 4-, or 5-block meals at breakfast, lunch, and dinner, plus 1- or 2-block snacks twice a day (one between lunch and dinner, one between dinner and bedtime). The section assumes you're doing CrossFit — i.e., active.
• Being a '4-blocker' means three meals a day, each built from 4 blocks of protein, 4 blocks of carb, and 4 blocks of fat. Whether you're a 'smallish' or 'largish' medium person decides whether your two daily snacks are 1 or 2 blocks.
• The hard rule: every meal and every snack must contain EQUIVALENT blocks of protein, carbohydrate, and fat. You don't mix a 4-block protein with a 2-block carb.
• How to build a meal once you know your size: use the block chart and pick (say, for a 4-block meal) four times something from the protein list, four times something from the carb list, and four times something from the fat list. A 1-block snack is one item from each list at face value; a 2-block snack is two of each.
• Non-fat protein exception: if a protein source is specifically labeled 'non-fat,' double the usual fat blocks for that meal (because that protein isn't bringing its normal fat along). The 'why' is in 'Enter the Zone.'
• On a Zone diet body fat comes off fast. When CrossFit's men drop below 10% body fat and start approaching 5%, the fat intake gets kicked up — the majority of their best athletes end up at X blocks of protein, X blocks of carb, and 4X or 5X blocks of fat. The lesson: learn to modulate fat to dial in a leanness that optimizes performance.
• The Zone is food-agnostic. It neither requires nor bans any particular food — it can run paleo, vegan, organic, kosher, fast food, or fine dining, while still delivering high-performance nutrition.
• Use Table 1 (Block Prescription by Sex and Body Type) as the starting point — it lays out blocks per meal and snack and a daily total for everyone from a small female (10 blocks/day) up to an athletic, well-muscled male (25 blocks/day). Pick the row that fits the client and start there.
• The block chart (the food lists) is your build tool: proteins, fats (nuts/seeds and 'other'), vegetables, processed carbohydrates, and fruits, each with an 'eyeball' amount and exact gram amounts for 1 block. Two notes that matter: fiber in carb sources is subtracted to determine a block, and a '*' marks foods that are virtually unlimited (over 5 cups for a block) — think leafy greens like arugula and watercress.
• Table 4 gives ready-made Sample Zone Meals and Snacks at 2-, 3-, 4-, and 5-block sizes for breakfast, lunch, and dinner, plus a long list of 1-block snacks. These are the 'what do I eat for dinner?' answer you hand a client so they're not stuck — same recipes scale cleanly up a block size at a time.
• There's a more precise way to find a client's number than the chart: the Zone block prescription formula = lean body mass (lb.) x activity level (g/lb. of lean body mass) / 7 (g protein per block).
• Activity level runs 0 to 1. For someone who works out several days a week without a labor-intensive job — most CrossFit athletes — use 0.7. Dividing 0.7 by 7 simplifies the whole thing to a shortcut: the prescription is just 10% of lean body mass.
• Bump the activity factor up if the athlete does CrossFit twice a day, trains for another sport on top of CrossFit, or has a strenuous daily job (construction, farming — and potentially coaching if you're on your feet all day). It's VOLUME of activity that raises the factor, not intensity — CrossFit workouts are intense but short, so intensity alone doesn't move it.
• Worked example: a 185 lb. athlete at 16% body fat doing CrossFit five days a week with an office job. Lean body mass = 185 - (0.16 x 185) = 185 - 29.6 = 155.4 lb. With activity factor 0.7, prescription = 155.4 x 0.10 = 15.54, or about 15 blocks/day. (Calipers are the convenient, reasonably accurate way to get body fat.)
• What 15 blocks looks like in macros (Table 1 in that article): protein 15 x 7 = 105 g (420 cal), carb 15 x 9 = 135 g (540 cal), fat 15 x 3 = 45 g (405 cal) — total about 1,365 calories. Note that total is an underestimate because of 'hidden calories': foods get filed under one macro even though they carry others (nuts are a fat but also have protein and carb), and those aren't counted.
• Rounding strategy: when the calculation has a decimal, you can round UP to the next whole block (e.g., 15.54 to 16), especially for someone likely to struggle with compliance — the Zone is calorie-restrictive and hard for new adopters, so rounding up may slow progress slightly but improves long-term adherence. Once they're used to it, round back down (e.g., to 15), especially if they haven't hit the body composition they want.
• Increasing fat intake — the restriction leans the athlete out while keeping protein and carb adequate for training, but they can get TOO lean. 'Too lean' is defined by performance: when losing mass coincides with dropping performance. It is NOT based on body weight or appearance alone.
• The fix for too-lean is to add calories by doubling fat (Table 2): keep protein at 105 g and carb at 135 g, take fat to 30 blocks x 3 g = 90 g (810 cal), total about 1,770 cal. The macro ratio shifts from 30/40/30 to roughly 23% protein, 31% carb, 46% fat.
• You can keep multiplying fat if mass loss and performance decline continue. Some CrossFit athletes run five times the fat (Table 3): fat 75 blocks x 3 g = 225 g (2,025 cal), total about 2,985 cal — a ratio of roughly 14% protein, 18% carb, 68% fat. Protein and carb blocks stay fixed; only fat climbs.

Words to know (plain English)

Block

The Zone's unit of measure for building balanced meals: 1 block = 7 g protein, OR 9 g carbohydrate, OR 3 g fat.

Block prescription

The number of blocks a person eats per day, set either off the body-type chart (Table 1) or by the formula, then split across meals and snacks.

4-blocker (block size)

A shorthand for someone whose meals are 4 blocks each — three meals a day of 4 blocks protein, 4 blocks carb, 4 blocks fat; the same idea applies to 2-, 3-, and 5-blockers.

40/30/30

The Zone macro split by calories when blocks are equal: 40% carbohydrate, 30% protein, 30% fat.

Fat block (1.5 g rule)

When building a meal, each fat block from the fat list is added at only 1.5 g of fat (not the full 3 g) because the protein source already supplies the other half.

Non-fat protein adjustment

If a protein is specifically labeled 'non-fat,' you double that meal's fat blocks, since the protein isn't bringing its usual fat.

Lean body mass (LBM)

Body weight minus fat weight. Calculated as total weight - (body fat % x total weight); it's the input for the block prescription formula.

Activity level / activity factor

A 0-to-1 multiplier in the prescription formula reflecting how much you train. 0.7 fits most CrossFit athletes; it rises with the VOLUME of activity, not intensity.

Block prescription formula

Lean body mass (lb.) x activity level / 7 (g protein per block). With activity 0.7 it simplifies to 10% of lean body mass.

Hidden calories

Calories from a food's secondary macronutrients that aren't counted because the food is filed under one macro (e.g., nuts are 'fat' but also carry protein and carb), which makes calorie totals an underestimate.

Too lean

The point where continued weight loss coincides with a drop in performance — defined by performance, not by body weight or appearance — signaling it's time to add fat calories.

Modulating fat intake

Adjusting only the fat blocks (2X, 5X, etc.) while holding protein and carb fixed, to dial in a leanness that optimizes performance and reverse the 'too lean' state.

Calipers

A convenient, reasonably accurate skinfold tool for measuring body fat percentage so you can compute lean body mass.

Key ideas to understand

• Whole, unprocessed foods are the best source of both macronutrients and micronutrients — best in composition, variety, and density — so supplementation is generally NOT recommended.
• Eating known quantities of high-quality whole foods is the single most important part of nutrition for performance and health. Supplements are poorer nutrient sources and a waste of focus for anyone not already eating the basic weighed-and-measured plan.
• There's exactly one supplement CrossFit recommends across the board: fish oil. It provides omega-3 fatty acids, a type of polyunsaturated fat.
• Background on fats: dietary (physiological) fats are triglycerides — a glycerol backbone with three fatty acids attached. Those fatty acids are a mix of saturated, monounsaturated, and polyunsaturated; one type is prominent in each food but all three are present to some degree.
• The two polyunsaturated fats found most in food are omega-3 and omega-6 — the difference is chemical structure.
• Polyunsaturated fats supply the two essential fatty acids — meaning the body can't make them, you must eat them: alpha-linolenic acid (ALA, an omega-3) and linoleic acid (LA, an omega-6).
• Omega-3s are the 'anti-inflammatory' fats; omega-6s are the 'pro-inflammatory' fats — based on their physiological functions. Both are needed in roughly equal amounts.
• The problem: modern diets carry far too much omega-6, pushing the body toward pro-inflammatory processes. The current omega-6:omega-3 ratio is about 20:1 or higher, where primitive populations were likely closer to 2:1.
• Dietary omega-6 comes from vegetable oils, nuts, conventionally raised (grain-fed/feed-lot) meat and eggs, and farm-raised fish.
• Even on the approved food list you can still end up pro-inflammatory: cutting processed food removes vegetable-oil omega-6, but most meat and eggs are conventionally raised (more omega-6 than wild or grass-fed), and nuts and seeds carry more omega-6 than omega-3.
• Fish-oil supplementation improves the omega-6 to omega-3 ratio and reduces inflammatory responses in the body.
• Fish oil supplies two omega-3s — EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) — the forms of omega-3 the brain and body prefer. The body can convert ALA into EPA and DHA, but the conversion is inefficient.
• Some practitioners recommend about 3 grams of combined EPA and DHA per day for an otherwise healthy person, though the exact amount depends on total omega-6 intake.
• Read the label: every brand has a different EPA/DHA concentration per serving, so you may need multiple servings to hit 3 grams — and some brands pad the omega-3 count with ALA, which isn't EPA or DHA.
• Flax seed or flax oil is NOT an appropriate omega-3 supplement: flax is a good source of ALA, but the poor ALA-to-EPA/DHA conversion makes it ineffective. Vegans can get DHA from algae oil.
• Research links fish oil to real benefits: omega-3s increase cell-membrane fluidity, and supplementation can improve insulin sensitivity, cardiovascular function, nervous-system function, immune health, memory, and mood.
• Safety note: omega-3s act as an anti-coagulant (blood thinner). Military personnel should consider stopping fish oil a couple of weeks before deployment, and anyone with upcoming surgery may want to stop two weeks out — and they should talk to their doctor.
• You CAN skip omega-3 supplementation if you're fastidious — avoid all vegetable oils (used in nearly every restaurant) and nuts and seeds, eat only grass-fed meat and pasture-raised eggs, and eat wild-caught fish a few times a week. Because that's impractical for most people, supplementation is effective.
• Ratio isn't the only thing — total polyunsaturated fat matters too. It's not ideal to take in high doses of either omega-6 OR omega-3, because polyunsaturated fats are less stable than other fats.
• Fish oil does NOT cancel out a bad diet — it won't undo fast food or excessive nuts and nut butters.
• The ideal total polyunsaturated intake isn't well established; an equal representation of saturated, monounsaturated, and polyunsaturated fats appears prudent. Individuals should work with a primary care doctor on whether supplementation is appropriate, especially with specific medical conditions.

Words to know (plain English)

Supplement

A product taken in addition to food (pills, oils, powders) to add specific nutrients. CrossFit's stance: generally not needed if you eat whole foods — fish oil is the one blanket exception.

Triglyceride

The form dietary fat takes — a glycerol backbone with three fatty acids attached. Those fatty acids are a mix of saturated, monounsaturated, and polyunsaturated.

Polyunsaturated fat

A type of fat that includes omega-3 and omega-6. Less chemically stable than saturated or monounsaturated fat, so total intake shouldn't be excessive.

Omega-3 fatty acid

An 'anti-inflammatory' polyunsaturated fat. Includes ALA (from plants) and, more usefully, EPA and DHA (from fish oil) — the forms the brain and body prefer.

Omega-6 fatty acid

A 'pro-inflammatory' polyunsaturated fat from vegetable oils, nuts, grain-fed meat/eggs, and farm-raised fish. Needed in small amounts, but modern diets have far too much.

Essential fatty acid

A fatty acid the body cannot make and must get from food. The two are alpha-linolenic acid (ALA, omega-3) and linoleic acid (LA, omega-6).

EPA and DHA

Eicosapentaenoic acid and docosahexaenoic acid — the two omega-3s in fish oil that the body actually uses well. The body converts ALA into them only inefficiently, so getting them directly matters.

Omega-6:omega-3 ratio

The balance of pro- to anti-inflammatory fats in the diet. Modern diets run ~20:1 or higher; primitive diets were near 2:1. Fish oil improves this ratio.

Anti-coagulant

Something that thins the blood / slows clotting. Omega-3s act this way, which is why fish oil may need to be paused before surgery or deployment — a physician's call.

Algae oil

A plant-based source of DHA suitable for vegans who can't take fish oil.

Key ideas to understand

• This article bridges the gap between CrossFit's philosophy of fitness and the actual workouts, how you get from theory to practice. It offers a model or template for programming. Important: CrossFit.com has never actually used this template, but it gives new trainers a way to apply variance inside CrossFit's methodology.
• At first the template looks like a routine, which seems to clash with the demand for constant variance. The resolution: the template still allows wide variance of mode, exercise, metabolic pathway, rest, intensity, sets, and reps. It's mathematically likely that any given three-day cycle is a one-of-a-kind stimulus that's never repeated in a lifetime of training. As Glassman put it, 'What your regimen needs is to not become routine.'
• The mission is to blend structure and flexibility: enough structure to define your programming goals, but not so rigid that it kills the radically varying stimulus the workouts need. The purpose of the template is as much descriptive (it reflects what good programming already looks like) as prescriptive.
• Macro view: the default is a three-days-on, one-day-off pattern. This allows a relatively higher volume of high-intensity work than other patterns tried. The athlete can work at or near max intensity for three straight days; by the fourth day the body is hammered enough that continued work gets noticeably less effective without backing off intensity.
• The drawback of three-on, one-off is that it doesn't line up with the five-on, two-off rhythm most of the world works on, or the seven-day week. For clients in professional settings or with family/work/school scheduling needs, there's a five-days-on, two-days-off version that works very well.
• History: the WOD started as five-on, two-off and worked perfectly. Three-on, one-off was created later to boost both the intensity of and recovery from the workouts, and feedback confirmed it succeeded. The takeaway: if life is easier on five-on, two-off, use it, the difference in potential isn't big enough to rebuild your whole life around. Convenience, attitude, exercise selection, and pacing will outweigh it.
• The template rotates three distinct modalities: monostructural metabolic conditioning (M), gymnastics (G), and weightlifting (W).
• Monostructural metabolic conditioning (M) is what people call 'cardio.' Its main purpose is to improve cardiorespiratory capacity and stamina. These are repetitive, cyclical movements you could sustain for long periods. Examples: run, bike, row, jump rope.
• Gymnastics (G) is bodyweight work and calisthenics. Its main purpose is to improve body control through neurological components, coordination, balance, agility, accuracy, and to improve functional upper-body capacity and trunk strength. Examples: air squat, pull-up, push-up, dip, handstand push-up, rope climb, muscle-up, press to handstand, back/hip extension, sit-up, jumps, lunge.
• Weightlifting (W) is the key weight-training basics, Olympic lifts and powerlifting, anything with an added external load. The aim is mainly to increase strength, power, and hip/leg capacity. Examples: deadlift, cleans, press, snatch, clean and jerk, medicine-ball drills/throws, kettlebell swing.
• The elements in each modality were chosen for their functionality, their neuroendocrine response, and their overall capacity to broadly and dramatically impact the body.
• Workout structure varies by how many modalities are in a given day: one, two, or three. Days 1, 5, 9 are single-modality; days 2, 6, 10 are couplets (two modalities); days 3, 7, 11 are triplets (three modalities). In every case each M, G, or W is a single exercise from that modality.
• Single-element days (1, 5, 9), recovery is NOT a limiting factor; the priority is the element itself. A single 'M' (day 1) is typically a long, slow distance effort. A single 'G' (day 5) is practice of one skill, usually one complex enough to need real practice but not yet ready for a timed workout. A single 'W' (day 9) is one lift, typically heavy and low-rep. These days are for long-distance cardio, high-skill gymnastics practice, and heavy single/low-rep lifting, NOT for sprints, pull-ups, or high-rep clean and jerks.
• Two-element days (2, 6, 10) are 'task priority': a couplet alternated for a set 3-5 rounds, performed for time and usually scored by time. The task is fixed and the time varies. The two elements are moderate to high intensity (made intense by pace, load, reps, or a mix), and work-rest interval management is critical. Ideally round one is hard but possible, and later rounds force pacing, rest, and breaking the work into manageable chunks.
• Three-element days (3, 7, 11) are 'time priority': a triplet repeated for a set number of minutes (typically 20) and scored by rounds/reps completed. The athlete is kept moving for a fixed time and the goal is as many cycles as possible. The elements are chosen so the challenge shows up only through repeated cycles; individually they're not that significant outside the blistering pace. This is in stark contrast to the higher-intensity two-element days, here work-rest management is only a marginal factor.
• As the number of elements rises from one to two to three, the workout's effect depends less on the individual element selected and more on the effect of repeated efforts. Each of the three day types has its own distinct character.
• Application: this template does NOT generate the CrossFit.com WOD, but the qualities of one-, two-, and three-element workouts seen on the WOD motivated its design. The mix has proven crushing in impact and unrivaled in bodily response, and athlete feedback on the WOD gave CrossFit a way to estimate and evaluate workout effects that might have taken decades otherwise.
• The most effective workouts are like art, remarkable in composition, symmetry, balance, theme, and character. There's a 'choreography' of exertion drawn from physiological knowledge, a sense of the limits of human performance, effective elements, experimentation, and even luck. The hope is the model helps you learn that art.
• What the template delivers: it encourages new skill development, generates unique stressors, crosses modes, incorporates quality movements, and hits all three metabolic pathways, all inside a framework of sets and reps and a cast of exercises CrossFit has repeatedly tested and proven.

Words to know (plain English)

Modality

One of CrossFit's three categories of movement used to build workouts: monostructural metabolic conditioning (M), gymnastics (G), and weightlifting (W).

Monostructural metabolic conditioning (M)

'Cardio', repetitive, cyclical movements (run, bike, row, jump rope) aimed at building cardiorespiratory capacity and stamina.

Gymnastics (G)

Bodyweight movements and calisthenics aimed at body control (coordination, balance, agility, accuracy) plus functional upper-body and trunk strength.

Weightlifting (W)

Any movement with an added external load, Olympic lifts and powerlifting basics, aimed at strength, power, and hip/leg capacity.

Couplet

A two-element workout pairing two modalities, usually performed for a fixed number of rounds for time.

Triplet

A three-element workout combining three modalities, usually repeated for a set time and scored by rounds/reps completed.

Task priority

A workout where the task (the rounds and reps) is fixed and the time varies; you race to finish set work, so the score is time.

Time priority

A workout where the time is fixed and the task varies; you keep moving for a set clock and score how many rounds/reps you complete (e.g., a 20-minute AMRAP).

Three-on, one-off

The default training cycle: three consecutive days of high-intensity work followed by one rest day, which allows higher intensity and better recovery.

Five-on, two-off

An alternate cycle (five training days, two rest days) that fits the typical workweek; nearly as effective and easier to schedule for many clients.

Metabolic pathways

The three energy systems (phosphagen, glycolytic, oxidative); the template is built to hit all three across its mix of workouts.

Neuroendocrine response

The hormonal and nervous-system response a movement provokes; one of the reasons specific elements were chosen for the template.

Variance

Deliberately varying mode, exercise, load, reps, rest, and intensity so training stays unpredictable and broadly effective rather than becoming a fixed routine.

Key ideas to understand

• Scaling just means modifying the workout so it's safe and productive for the person in front of you — the CrossFit.com workouts are written to challenge the most advanced athlete, so most people need to change something.
• Finding a CrossFit affiliate is one way to get proper coaching through scaling; this article is the basic playbook when an experienced trainer isn't there.
• Athletes scale for different lengths of time depending on their athletic background and current health and fitness — plan on at least a month of significant scaling for a beginner. This break-in period builds movement competency AND eases the athlete into intensity and volume gradually.
• Mechanics and consistency come first, intensity last — that's CrossFit's charter for the best balance of safety, efficacy, and efficiency. Don't add load and speed until the movement is correct and repeatable. Skipping that order raises injury risk and can stall long-term progress, especially when bad mechanics meet load.
• For a brand-new athlete, just doing the movements unloaded can already be intense — that's fine.
• The one rule that governs everything: PRESERVE THE STIMULUS. The stimulus is the effect of the specific mix of movements, time domain, and load. Adjust the pieces so the workout hits each athlete roughly the same way regardless of ability.
• There is no single scaling rule — the range of workouts and beginners is too wide. Use your judgment or a qualified trainer's. Deviating from these guidelines can be the right call, especially for advanced athletes.
• Don't be afraid to change the workout AFTER it has started — if form goes bad, stop the workout or drop the load to where mechanics are clean.
• Two things must be scaled for every beginner: intensity and volume. A solid starting method is cutting intensity and/or volume by half for at least two weeks, then building back up over weeks, months, and years as the athlete progresses.
• Intensity is the power the athlete generates, and you modify it three ways: load, speed, and/or volume.
• Load is the FIRST variable to scale — it's the easiest way to match the stimulus to an athlete's capacity, and it stays the most common thing you adjust even after the beginner period. On conditioning workouts, pick a load the athlete can complete the first set or round with WITHOUT breaking form or hitting muscular failure.
• Beginner loads are estimates — scaling won't be perfect, and newer athletes are often under 50% of the prescribed load, especially if they're new to lifting. Err on the side of scaling too much, not too little.
• Speed is mostly self-regulated by the athlete's fitness, but a coach can manage it — sometimes you slow an athlete down to fix mechanics, occasionally you push a well-moving athlete to go faster (less common with beginners).
• Volume is the total work done, and you lower it by cutting time, reps/rounds, and/or distance.
• Beginners will try to grind through a workout that's beyond their current capacity — a workout an advanced athlete finishes in 2 minutes might take a new athlete 15+ minutes as written. Times don't have to match, but they should be relatively similar (Fran should still finish within several minutes).
• Lowering volume does two jobs: it can raise intensity (more power), AND it lets muscles, ligaments, and tendons adapt gradually — which cuts excessive soreness and the risk of rhabdomyolysis and injury.
• Movement substitution is the LAST variable to change, because avoiding a movement keeps the athlete from ever getting good at it. Try reducing the load before swapping the movement — e.g., do the snatch with a PVC pipe rather than substituting 95-lb. overhead squats.
• Swap a movement out entirely when there's a physical limitation or injury, or when load can't be reduced any further. When choosing a substitute, preserve the original movement's function and range of motion as closely as you can.
• Four things to weigh when picking a substitute: (1) is it primarily lower-body or upper-body driven, (2) its function (push vs. pull), (3) its range of motion — specifically at the hips, knees, and ankles, and (4) its plane of movement.
• The sample week shows the same logic in action — each WOD gets versions that adjust volume, load, and movements, and these are just a few of many possible options. They don't replace what an experienced trainer would build for a specific athlete.
• Bottom line: focus on movement proficiency before speed and load, scale significantly for at least a month (especially intensity and volume), and expect to keep scaling load for months or years. Scaled right, the athlete makes real gains by training at their own level of physical and psychological tolerance.

Words to know (plain English)

Scaling

Modifying a workout (load, volume, speed, or movement) so it's safe and productive for a specific athlete while still doing what the workout was designed to do.

Preserve the stimulus

The governing rule of scaling — adjust the pieces so the workout produces roughly the same effect on each athlete, regardless of their physical ability.

Stimulus

The training effect of a workout, created by its specific combination of movements, time domain, and load.

Mechanics, consistency, then intensity

CrossFit's charter for safe progress — get the movement correct (mechanics), make it repeatable (consistency), and only then add speed and load (intensity).

Intensity

The amount of power an athlete generates; modified by changing load, speed, and/or volume.

Load

The weight used — the first and most common variable to scale because it's the easiest way to match the stimulus to an athlete's capacity.

Volume

The total amount of work done in a workout; lowered by cutting time, reps/rounds, and/or distance.

Time domain

The duration or time structure of a workout (for time, AMRAP in X minutes, etc.) — one of the three pieces that make up the stimulus.

Movement substitution

Swapping a prescribed movement for a different one — the LAST variable to change, used mainly for injury/limitation or when load can't be reduced; choose a sub that preserves the original's function and range of motion.

Rhabdomyolysis (rhabdo)

A serious condition where overworked muscle breaks down and releases contents into the blood, risking kidney damage; one reason to scale volume for beginners.

Range of motion (ROM)

How far a joint travels through a movement — specifically hips, knees, and ankles — a key thing to match when substituting a movement.

Plane of movement

The direction/orientation in which a movement happens; a consideration when picking a substitute so the swap stays as similar as possible.

Key ideas to understand

• The whole point of this article is to PROVE universal scalability -- if Angie, Barbara, Chelsea, Diane, Elizabeth, and Fran can be made to work for grandmas, they can be made to work for anyone.
• The golden rule of scaling: preserve the stimulus. You adhere to as many of the original workout factors as possible, relative to that individual's physical AND psychological tolerances. You keep what makes the workout what it is; you adjust what they can't yet handle.
• Two scaling levers show up over and over here: substitute the movement (swap to an easier version that hits the same pattern) and reduce the volume/load (fewer reps, fewer rounds, lighter weight, shorter clock).
• Angie (original: 100 pull-ups, 100 push-ups, 100 sit-ups, 100 squats for time) scales to 25 ring rows, 25 push-ups off the knees, 25 sit-ups, 25 squats -- same four movements and same couplet logic, just substituted pulling/pushing and quartered volume.
• Barbara (original: 5 rounds of 20 pull-ups / 30 push-ups / 40 sit-ups / 50 squats, 3 min rest between rounds) scales to 3 rounds of 20 ring rows / 30 push-ups off the knees / 40 sit-ups / 50 squats, keeping the 3-minute rest. Note: the rep scheme per round stays the same -- they cut the number of rounds, not the reps, and kept the rest interval that defines Barbara.
• Chelsea (original: 5 pull-ups / 10 push-ups / 15 squats every minute on the minute for 30 minutes) scales to 5 ring rows / 10 push-ups off the knees / 15 squats EMOM for 20 minutes -- same EMOM structure and same rep triplet, just substituted movements and a shorter total duration.
• Diane (original: 21-15-9 deadlift 225 lb. and handstand push-ups) scales to 21-15-9 deadlift 50 lb. and dumbbell shoulder press 10 lb. -- the 21-15-9 couplet stays, the deadlift load drops, and the inverted handstand push-up becomes an upright dumbbell shoulder press (same vertical press pattern, far less skill and risk).
• Fran (original: 21-15-9 thruster 95 lb. and pull-ups) scales to 21-15-9 thruster 25 lb. and ring rows -- keep the 21-15-9 thruster/pull couplet, lighten the thruster, and swap the pull-up for the ring row.
• Elizabeth (original: 21-15-9 clean 135 lb. and ring dips) scales to 21-15-9 clean 25 lb. and bench dips -- keep the 21-15-9 clean/dip couplet, lighten the clean, and swap ring dips for the much more accessible bench dips.
• Across all six, the pattern is identical: keep the rep scheme and the movement pattern (the stimulus), and adjust load, total volume, and movement difficulty to fit the person in front of you.
• The common substitutions to memorize: pull-up -> ring row, push-up -> push-up off the knees, handstand push-up -> dumbbell shoulder press, ring dip -> bench dip, and heavy barbell -> light barbell.

Words to know (plain English)

Scaling

Adjusting a workout (load, volume, movement) so a given athlete can do it safely and effectively while keeping its intended effect.

Preserve the stimulus

The guiding rule of scaling -- keep as many of the original workout's defining factors (rep scheme, movement pattern, time domain) as possible relative to the person's physical and psychological tolerances.

Benchmark / 'The Girls'

Named, repeatable standard workouts (Angie, Barbara, Chelsea, Diane, Elizabeth, Fran) used to measure progress over time.

Ring row

A scaled pulling movement -- rowing the body up to gymnastics rings from an angled body position; the standard sub for the pull-up.

Push-up off the knees

A scaled push-up performed from the knees to reduce the load while keeping the pushing pattern.

Dumbbell shoulder press

An upright vertical press with dumbbells -- the accessible scale for the handstand push-up's inverted pressing pattern.

Bench dip

A dip performed with hands on a bench and feet on the floor -- the easy scale for ring dips.

21-15-9

A descending rep scheme: 21 reps, then 15, then 9 of each movement -- the structure behind Diane, Fran, and Elizabeth.

EMOM (every minute on the minute)

A format where you perform a set amount of work at the start of each minute and rest the remainder -- the structure of Chelsea.

Psychological tolerance

How much intensity/volume an athlete can handle mentally and emotionally, not just physically -- a factor you respect when scaling.

Key ideas to understand

• At most affiliates, group classes outnumber private sessions. The same coaching shows up in both, but a group adds logistical pressure, so planning matters more, not less.
• Programming a good workout and offering scaling options is only PART of running a class. At a minimum, draft a warm-up, workout, and cool-down plan before class that lays out how long each part takes and exactly what is in it.
• Use the warm-up checklist as your filter: does it raise core temperature, prepare athletes for the workout's intensity, let you correct the mechanics the workout needs, let you assess who needs scaling, and (time permitting) build skill — even on movements not in the workout?
• Use the workout checklist: does it describe range-of-motion standards, include scaling for EVERY athlete in the room, let each athlete hit their own relative high intensity, challenge their current fitness, and let you keep correcting mechanics while intensity is high?
• Use the cool-down checklist: does it let heart rate and breathing slow and mental sharpness return, let athletes log their score to track progress, reset the gym for the next class, and use leftover time for recovery, extra skill work, or education?
• The class is COACH LED start to finish. Demonstrate every new piece before athletes do it, and keep cueing better positions through every section — whiteboard, warm-up, workout, cool-down.
• Every lesson plan follows the same skeleton: whiteboard brief, general warm-up, movement-specific warm-up(s), a short break and logistics/safety check, the workout, then the cool-down — all inside a 60-minute window.
• Each lesson plan starts with an INTENDED STIMULUS (what the workout is supposed to feel like and accomplish) and a BREAKDOWN (rep targets, time estimates, the Rx'd female weight, scaling options, and the specific things to demonstrate, ask, and explain).
• Fran (21-15-9 thrusters at 95 lb. and pull-ups, scored by total time) is a fast couplet — lower-body push paired with upper-body pull — that lets movement stay continuous, so the real challenge is managing a very high heart rate, not strength.
• On Fran, the rule of thumb for unbroken work: don't break the movements more than three times in the set of 21, twice in the 15, once in the 9; aim to finish under 10 minutes; if a scaled Fran came in under 5 minutes last time, make it harder.
• The Fran lesson plan uses progressive specific warm-ups: a pull-up warm-up where 8-10 consecutive pull-ups predicts the athlete can handle the prescribed reps, and a thruster warm-up where you assess the movement to set the right workout load.
• The back squat lesson plan (5-5-5-5-5, score = max load for a set of 5) is a single-modality weightlifting HEAVY day with ascending sets; at 5 reps it biases toward strength-stamina, not a true 1-rep max, and demands 3-5 minutes rest between working sets.
• On a heavy day, EVERY athlete should find a heavy set of 5 relative to their own capacity; beginners or intermediates without an established 5-rep max may do more than five working sets, as long as total volume stays appropriate, and you reduce load when reps fail or form breaks down.
• The 20-minute AMRAP (400-m run, 15 L pull-ups, 5 reps of 205-lb. clean and jerk, scored by rounds and reps) is a triplet — monostructural, gymnastics, weightlifting — built so the run elevates heart rate and makes the other two harder; load and reps should be well within capacity when each is considered alone.
• WOD Scale pages give you ready-made BEGINNER and INTERMEDIATE versions of each workout that preserve the stimulus by adjusting load, volume, or movement (e.g., ring rows for pull-ups, reduced run distance, lighter clean and jerk) — but you're encouraged to use judgment for challenging-but-manageable substitutions per athlete.
• Every workout block includes the same coach housekeeping: demonstrate each movement with its standards, explain how it's scored, and ASK whether any athletes are injured before they start.
• The break-and-logistics block before the workout is your safety gate: bathroom, review each athlete's scaling, check for adequate space around barbells (including bounce room) and pull-up stations, teach/confirm spotting on the heavy day, then re-brief the workout, flow, and safety.

Words to know (plain English)

Intended stimulus

What a workout is designed to feel like and accomplish — the time domain, loading, and challenge it should produce. You scale TO preserve this, not just to make a workout easier.

Breakdown

The coaching notes for a workout: rep and time targets, the Rx'd weights, scaling options, and the things the coach must demonstrate, explain, and ask before starting.

Rx'd (as prescribed)

The standard, unscaled version of a workout — the prescribed loads, reps, and movements (e.g., 95-lb. thrusters for men, 65-lb. for women on Fran).

Couplet / triplet

A workout built from two movements (couplet, like Fran) or three movements (triplet, like the 20-minute AMRAP). Pairing complementary patterns lets athletes keep moving.

AMRAP

As Many Rounds (and reps) As Possible in a set time. The 20-minute AMRAP is scored by completed rounds and reps.

Monostructural / gymnastics / weightlifting

The three modalities CrossFit draws from: monostructural is cardio-type work like running or rowing; gymnastics is bodyweight movement like pull-ups; weightlifting is loaded movement like the clean and jerk.

Heavy day

A single-modality strength session (e.g., back squat 5-5-5-5-5) where the goal is to find a heavy load for the rep scheme, with long rest between sets.

Ascending sets

Adding load after every set, so each working set is heavier than the last.

L pull-up

A pull-up performed with the legs held straight out in an 'L' the whole time; it demands more midline and pulling strength than a strict pull-up, and the legs start elevated rather than swinging up with momentum.

Threshold training

Pushing an athlete's intensity right up to the edge of where mechanics would break down — high intensity on sound technique, the line a coach manages during the workout.

General vs. specific warm-up

The general warm-up raises temperature and primes the whole body; the specific warm-up builds and assesses the exact movements (and load) the workout will use.

Key ideas to understand

• Coaching is communication, and communication gets way easier when you and the athlete share the same words for body parts and for how those parts move. This whole lesson exists to make athletes more coachable, not to turn them into anatomy students.
• Learn just FOUR body parts: tibia, femur, pelvis, and spine. That's it -- you don't need a textbook's worth of names.
• Group those four parts into two things athletes can feel: the LEG is the tibia plus the femur, and the TRUNK is the pelvis plus the spine.
• Learn THREE joints (the spine itself not counted as one): the knee connects tibia to femur, the hip connects femur to pelvis, and the sacroiliac (SI) joint connects pelvis to spine. Also make the point that the spine is really a whole bunch of joints stacked up.
• Learn TWO directions of motion: flexion is reducing the angle of a joint (closing it), extension is increasing the angle of a joint (opening it). Same two words work at every joint.
• Before moving on, test the athletes -- can they flex and extend the leg (knee), hip, spine, and trunk (SI) on cue? Once that's solid, cue combinations like 'flex one leg and your trunk but NOT your hip' to prove they really own it.
• Then the payoff: three simple rules of biomechanics. Rule one -- functional movement weds the spine to the pelvis; the SI joint and spine are built for small movement in many directions, so keep the trunk tight and solid for running, jumping, squatting, throwing, cycling, everything.
• Rule two -- the power of those movements comes from the HIP, primarily hip extension. Powerful hip extension is necessary and nearly sufficient for elite athletic capacity.
• Rule three -- do not let the pelvis chase the femur instead of the spine. That mistake is 'muted hip function': the hip angle stays open, so it has nothing left to extend and the movement loses its power.
• The whole package -- four parts, three joints, two motions, three rules -- gives a small but powerful shared lexicon whose immediate effect is a more coachable athlete.

Words to know (plain English)

Tibia

The shin bone -- the lower leg bone between the knee and ankle.

Femur

The thigh bone -- the upper leg bone between the hip and knee.

Pelvis

The hip bone structure that the femur attaches to below and the spine attaches to above.

Spine

The back/vertebral column. Has a natural 'S' shape and is really many small joints stacked together.

Knee joint

The joint connecting tibia and femur -- the bend in the leg.

Hip joint

The joint connecting femur to pelvis -- where most athletic power is generated.

Sacroiliac (SI) joint

The joint connecting pelvis to spine; built for small movement in many directions, so we keep it tight during lifts.

Leg

Coaching shorthand for the tibia plus the femur together.

Trunk

Coaching shorthand for the pelvis plus the spine together.

Flexion

Reducing (closing) the angle of a joint.

Extension

Increasing (opening) the angle of a joint.

Hip extension

Opening the hip angle by driving the pelvis and femur apart -- the primary source of athletic power; 'power comes from the hip.'

Midline stabilization

Keeping the trunk tight and solid -- the spine wedded to the pelvis as one unit -- through a movement.

Muted hip function

The fault where the pelvis chases the femur instead of staying with the spine; the hip angle stays open and can't extend, so the movement loses power.

Key ideas to understand

• The squat is essential to your well-being — it improves athleticism and keeps the hips, back, and knees sound into old age.
• The squat is not bad for the knees — it's remarkably rehabilitative of cranky, damaged, or delicate knees, hips, and backs. The flip side: if you DON'T squat, your knees aren't healthy, no matter how pain-free you feel.
• The squat is no more invented by a coach than the hiccup or the sneeze — it's a natural, functional component of being human. The bottom of the squat is nature's intended sitting posture (chairs aren't part of our biology), and rising from the bottom is the biomechanically sound way we stand up.
• Most of the world sits in a squat, not on chairs — meals, ceremonies, conversation, and defecation all happen without seats. Only the industrialized world needs chairs, and that costs us functionality and contributes to decrepitude.
• When a doctor or chiropractor tells someone not to squat, it's almost always ignorance — ask by what method the patient is supposed to get off the toilet and they're stuck for an answer.
• The 'don't bend the knee past 90 degrees' advice is nonsense — you can't even stand up off the floor without bending a knee well past 90, and getting up off the floor loads at least one knee far more than a squat does.
• People who counsel against squatting are usually repeating media/gym myths, or they've seen people hurt themselves squatting INCORRECTLY. Yes, you can injure yourself with a bad squat — but it's also exceedingly easy to make the squat as safe as walking.
• Athletically, the squat is the quintessential hip-extension exercise, and hip extension is the foundation of all good human movement. Powerful, controlled hip extension is necessary AND nearly sufficient for elite athleticism — without it you're nowhere near your potential, and everyone who can explosively open the hip can also run, jump, throw, and punch hard.
• The squat also elicits a potent neuroendocrine response — by itself a strong reason to include it.
• There's a long list of cues to a sound squat (22 of them) — many drive the same behavior. Key ones: feet about shoulder width and slightly toed out; head up looking slightly above parallel, never down; accentuate the lumbar arch then pull the excess out with the abs; midsection very tight; butt back and down; knees track over the line of the foot and never roll inside it; weight on the heels, off the balls of the feet; delay the knees' forward travel; in profile the ear travels straight down, not forward; pull yourself down with the hip flexors rather than just sinking; break parallel (hip fold below the knee); rise by squeezing glutes and hams with no forward lean; return on the exact path you descended; use every bit of musculature; and stand as tall as possible at the top.
• All athletes start with the AIR SQUAT — body weight only. 'Squat' on its own means an unladen, body-weight squat; weighted versions get named: back squat, front squat, overhead squat. Loading those before the air squat is mastered retards athletic potential and compromises safety and efficacy.
• The squat is mastered when both technique AND performance are superior — no points of performance are deficient, and fast multiple reps are possible. The favorite standard: a Tabata squat (20s on / 10s off x 8) where the weakest of the eight intervals is 18-20 perfect reps. Don't even think about weighted squats until you can do that.
• The most common faults to look for: surrendering the lumbar curve at the bottom (rounding the back — maybe the worst fault), not breaking parallel, slouching the chest and shoulders, lifting the heels, and not fully extending the hip at the top.
• A small angle of hip extension (an upright-but-shallow beginner's/weak squat from weak hip extensors) is NOT strictly a fault as long as the lumbar spine stays neutral.
• There are five root causes of a bad squat: weak glute/hamstring; poor engagement/weak control/no awareness of the glute and ham (a three-to-five-year odyssey to build); trying to squat with the quads (leg-extension dominance); inflexibility (tight hamstrings pull you into lumbar flexion — the worst fault); and sloppy work / poor focus.
• There are specific therapies for fixing faults: Bar Holds (settle into a perfect bottom holding a high, close bar; let go, repeat higher/closer — lifts the squat and loads the heels and glute/hams); Box Squatting (squat to a 10-inch box, rest without losing posture, squeeze and rise without rocking — perfected at Westside Barbell); Bottom-to-Bottoms (live at the bottom, come to full extension only briefly and return, spending far more time down than up — learn to like the bottom); and Overhead Squats (broomstick at snatch-grip overhead, arms locked, the arm-stick triangle stays perpendicular to the ground — a shoulder stretch that instantly diagnoses tightness and 'lifts' the squat).
• The troubleshooting table maps faults to causes to therapies — e.g., not hitting parallel comes from weak hip extensors/laziness/quad dominance and is fixed with bottom-to-bottoms, bar holds, and box squatting; rolling knees inside the feet comes from weak adductors/abductors and quad cheating and is fixed by pushing the feet to the outside of the shoe and deliberately abducting (trying to stretch the floor apart).
• The broomstick overhead-squat foundation is critical to learning the snatch — the world's fastest lift.
• Two named weighted squats close the section: the FRONT SQUAT (bar racked on the chest and shoulders with a loose grip; mechanics otherwise like the air squat; the rack position is the hard part and forces shoulder and wrist flexibility — handstands help), and the air-squat points of performance recap: maintain the back arch, look straight ahead, weight on heels, full range of motion below parallel, chest high, midsection tight.

Words to know (plain English)

Air squat

The unladen, body-weight-only squat; when CrossFit says 'squat' with no qualifier, this is it. All athletes start here and master it before loading.

Back squat / Front squat / Overhead squat

The named weighted squats — bar on the back, bar racked on the chest/shoulders, and bar locked out overhead, respectively. Loading any of these before the air squat is mastered hurts potential and safety.

Hip extension

Opening the hip joint (driving the hips from a bent to a straight position) — the foundation of all good human movement and the athletic essence of the squat. Powerful, controlled hip extension is necessary and nearly sufficient for elite athleticism.

Breaking parallel

Descending until the fold/crease of the hip drops below the top of the knee — the depth standard for a full squat.

Lumbar curve / lumbar extension

The natural arch of the lower back. Keeping it (not letting it round into lumbar flexion) is critical; surrendering it at the bottom is the worst squat fault.

Points of performance

The specific technique standards that define a correct rep; a squat is 'mastered' only when none of them are deficient.

Neuroendocrine response

The hormonal/nervous-system response a hard, full-body movement like the squat triggers — a benefit that on its own justifies including the movement.

Tabata squat (mastery standard)

Eight intervals of 20 seconds of squats / 10 seconds rest; the squat is considered mastered when the weakest of the eight intervals is 18-20 perfect reps.

Quad dominance / leg-extension dominance

Driving the squat mostly with the quadriceps (knee extension) instead of the hips — a leading obstacle to elite performance and a cause of a bad squat.

Bar Holds

A fault-fixing drill: settle into a perfect bottom while holding a bar racked higher and closer than normal, then let go and repeat higher/closer — 'lifts' the squat and loads the heels and glute/hams.

Box Squatting

Squatting to a ~10-inch box, resting at the bottom without losing posture, then squeezing up without rocking forward; a technique perfected at the Westside Barbell Club.

Bottom-to-Bottoms

Spending most of the time in the bottom of the squat and rising to full extension only briefly before returning — teaches the athlete to be comfortable and strong at the bottom.

Key ideas to understand

• The overhead squat is the ultimate core exercise, the heart of the snatch, and peerless for developing effective athletic movement.
• It trains efficient transfer of energy from large to small body parts — the essence of sport movement — which makes it indispensable for developing speed and power.
• It demands and develops functional flexibility, and it develops the squat itself by amplifying and cruelly punishing any fault in squat posture, movement, and stability.
• What the clean and snatch are to power, the overhead squat is to midline control, stability, and balance — unsurpassed.
• It's deceptively simple yet universally troublesome for beginners. Three common obstacles: (1) the scarcity of skilled instruction — outside the weightlifting community most overhead-squat instruction is flat wrong; (2) a weak squat — you need a rock-solid squat first; and (3) starting with too much weight — you cannot learn it with a bar. Use a dowel or PVC pipe; anything over 5 lb. will leave your overhead squat 'stillborn.' Even a 15-lb. training bar is way too heavy to learn it.
• There's a seven-step learning progression. Step 1: only start when you have a strong squat and use a dowel/PVC — you should be able to hold a rock-bottom squat (back arched, head and eyes forward, weight predominantly on the heels) for several minutes as a prerequisite.
• Step 2: learn locked-arm 'dislocates' / 'pass-throughs' with the dowel — move it nearly 360 degrees from in front of the body to behind it without bending the arms. Start with a wide grip and bring the hands in until the pass-through is a moderate shoulder stretch — that's your training grip.
• Step 3: perform the pass-through at the top, the bottom, and everywhere in between while descending — stop at several points on the way down, hold, and slowly swing the dowel front to back with locked arms.
• Step 4: learn to find the frontal plane with the dowel from every position — practice with eyes closed to build a keen sense of where the frontal plane is, bringing the dowel to a stop in the plane each time. Have a partner verify.
• Step 5: start the rep standing tall with the dowel held as high as possible in the frontal plane — directly overhead, NOT behind you and definitely not in front.
• Step 6: lower very slowly to the bottom keeping the dowel in the frontal plane the whole way. A partner watches from the side; moving slightly BEHIND the frontal plane is acceptable, FORWARD is dead wrong. If you can't keep the dowel back, the grip may be too narrow — you must pull it back deliberately as you descend, especially if the chest comes forward.
• Step 7: practice regularly and add load in tiny increments — 2.5-lb. plate, then 5, then 5+2.5, then 10, then a 15-lb. bar — but only with perfect form. There's no benefit to adding weight if the dowel/bar can't stay in the frontal plane.
• With practice you can bring the hands closer together and still keep the bar in the frontal plane — eventually descending to a rock-bottom squat with feet together and hands together. That's a superb warm-up/cool-down drill and stretch.
• The overhead squat builds core control by punishing any forward wobble with an enormous, instant increase in the moment about the hip and back. Held perfectly overhead and still (nearly impossible), it doesn't add load on the hip or back — but moving too fast, on the wrong line of action, or wiggling brings even light loads down 'like a house of cards.'
• You have exactly two safe bailout options: dump the load forward and step/fall backward, or dump it backward and step/fall forward. Both are safe and easy. Lateral escapes are NOT an option.
• The gap between your overhead squat and your back/front squat is a solid measure of your midline stability, control, and squatting precision — and developing the overhead squat fixes faults that aren't even visible in the back and front squat.
• Use the numbers: an average of your max back and front squat measures core, hip, and leg strength; your max overhead squat measures core stability/control and your ability to generate effective, efficient athletic power. The overhead squat will always be a fraction of the back/front average, but over time they should CONVERGE.
• If they diverge, you're building hip and core strength but losing the ability to apply power distally (to the extremities) — and you may be injury-prone in athletic pursuits. If they converge, you're building useful strength and power that transfers to athletic movement.
• The real-world utility: many objects are high enough to get under but too heavy or not free enough to be jerked or pressed overhead — you can still elevate them by lowering your hips until the arms lock out, then squatting up.
• The angle diagram (Figure 8) explains the mechanics: 'A' is the torso's angle of inclination above horizontal — as a squat matures this angle increases and the squat becomes more upright as posterior-chain strength and neural 'connectedness' grow; low angles cantilever onto the quads off a weak posterior chain (mechanically disadvantaged under load). '90-A' is the arm rotation past overhead needed to keep the bar in the frontal plane — the lower A, the more rotation and the wider the grip required. Posterior-chain strength ultimately determines grip width, squat elevation, and shoulder rotation. Maturity and quality of the squat determine ALL the mechanics of the overhead squat.
• Bar positions in the diagram: position 'a' is the overhead squat (with perfect stability it adds no moment about the hip/back); 'b' is roughly the back/front squat; 'c' has the load behind the frontal plane and can actually DECREASE the moment as long as balance holds; 'd' is in front of the plane — a fatal flaw, where even slight movement greatly increases the moment and can collapse the squat like a house of cards. The frontal plane ('f') divides front half from back half, and the goal is to keep the load in it.

Words to know (plain English)

Overhead squat

A full squat performed with the load locked out overhead in the frontal plane; the ultimate core/midline movement and the foundation of the snatch.

Frontal plane

The vertical plane dividing the body's front half from its back half; the line the athlete keeps the load in throughout the overhead squat. Behind it can be acceptable; in front of it is a fatal flaw.

Dislocates / pass-throughs

A mobility drill moving a dowel in a wide, locked-arm arc from in front of the body to behind it; used to find shoulder range and set the overhead-squat training grip width.

Training grip

The hand spacing at which a pass-through produces a moderate shoulder stretch — the grip width used to learn and perform the overhead squat.

Midline stabilization / midline control

Keeping the spine and torso rigid and aligned under load; the overhead squat is the premier test and developer of it.

Moment (about the hip and back)

The rotational/torque load on the hip and back; forward drift of the bar instantly and enormously increases it, collapsing the squat 'like a house of cards.'

Line of action

The path the load travels; moving on the wrong line (or too fast, or wiggling) brings even light loads down in the overhead squat.

Distal application of power

Transferring force out to the small/far body parts (the extremities); convergence of the overhead squat with the back/front squat shows this ability is developing.

Posterior chain

The muscles on the back of the body (glutes, hamstrings, back); its strength and neural 'connectedness' determine the squat's uprightness, grip width, and shoulder rotation in the overhead squat.

Angle of inclination (A)

The torso's angle above horizontal in the squat; it increases (becomes more upright) as posterior-chain strength grows. Low angles cantilever onto the quads and are mechanically disadvantaged under load.

Key ideas to understand

• The progression runs shoulder press to push press to push jerk, a longtime CrossFit staple. As you move up the chain, each lift becomes more athletic, more functional, and suited to heavier loads, while leaning more and more on the hip.
• Why these lifts matter: they teach essential motor recruitment patterns found in sport and life, and they massively build strength in the upper body and the 'power zone.' For power-zone and functional recruitment, the push press and push jerk have no peer, even the bench press (the 'king' of upper-body lifts) can't touch them.
• The big concept they teach is core-to-extremity recruitment: good athletic movement starts at the core and radiates out to the extremities. As you climb the progression, this concept gets learned and reinforced. This alone would justify training these lifts.
• Why core-to-extremity is everything: the most common errors in punching, jumping, throwing, and countless athletic movements are violations of this concept. Because movement begins at the core, core strength is absolutely essential to athletic success.
• The 'power zone' is the region of the body these movements emanate from, the core. Its muscle groups are the hip flexors, hip extensors (glutes and hams), spinal erectors, and quadriceps.
• The push press and jerk also train power and speed, which are 'king' in sport. Power and speed come from coupling force with velocity, and these lifts are performed explosively, that's the hallmark of speed and power training. Many great lifts (like a slow grind) lack this explosive quality.
• These lifts are the perfect tool to expose and destroy the muted hip, a postural/mechanical fault where the pelvis 'chases' the leg during hip flexion. It plagues more athletes than not, and a push press under heavy stress conjures it up so you can eliminate it.
• SHOULDER PRESS setup: take the bar from supports or clean it to the rack; bar on the shoulders, grip slightly wider than shoulder width, elbows below and in front of the bar, stance about hip width. Press: drive the bar to directly overhead, and the head must move out of the way to let the bar pass (the head 'accommodates' the bar).
• PUSH PRESS setup is the same as the shoulder press. Then DIP: bend the hips and knees while keeping the torso upright, only a couple of inches. DRIVE: with NO pause at the bottom of the dip, forcefully extend the hips and legs. PRESS: as the hips and legs finish extending, the shoulders and arms forcefully press the bar overhead to full extension.
• PUSH JERK setup, dip, and drive are identical to the push press. The difference is the PRESS UNDER: instead of just pressing, you press AND dip a second time at the same moment, catching the bar in a partial squat with arms fully locked out overhead. FINISH: stand fully erect with the bar overhead, same finish as the push press and shoulder press.
• The role of the abs in overhead lifts: the abdominals' primary athletic job is midline stabilization, NOT trunk flexion. That stabilizing role is never more critical than when driving loads overhead, and the heavier the load, the more critical it gets. Train every exercise as an ab exercise, but in overhead lifts it's essential.
• How to spot weak ab engagement overhead: the body arches so the hips, pelvis, and stomach push ahead of the bar. Constant vigilance is needed from every lifter to prevent and correct this postural deformation.
• Summary of the hip's growing role: in the shoulder press the power zone is used for stabilization only. In the push press it provides both stability AND the primary impetus in the dip and drive. In the push jerk it's called on for the dip, drive, second dip, and squat. The hip's role increases at every step.
• The payoff in load: the push press lets you drive as much as 30% more overhead than the shoulder press, and the push jerk lets you drive as much as 30% more than the push press. The hip is increasingly recruited to help the arms and shoulders raise the load.
• As you master the push jerk it will unconsciously displace the push press as your go-to for going overhead. And as you master technique and add load, the second dip gets lower and lower, until at very heavy loads the upper body contributes only a fraction and an increasing share of the lift is done by the overhead squat (the catch becomes very low).
• On both the push press and jerk the 'dip' is critical to the whole movement: the stomach is held very tightly and the turnaround from dip to drive is sudden, explosive, and violent.
• TRY THESE practice protocols: (1) start at 95 lb and push press or push jerk 15 straight reps, rest 30 sec, repeat for 5 sets of 15; go up in weight only when all 5 sets are done with just 30 sec rest and no pause in any set. (2) Rep 1 shoulder press, Rep 2 push press, Rep 3 push jerk; repeat until the shoulder press is impossible, then continue until the push press is impossible, then five more push jerks; start at 95 lb and add load only when total reps exceed 30.

Words to know (plain English)

Shoulder press (strict press)

An overhead press with no help from the legs; the bar goes from the rack to overhead using only the arms and shoulders, with the hip stabilizing.

Push press

A press that adds a short, vertical dip and explosive hip-and-leg drive, then presses the bar to lockout; lets you move ~30% more than a strict press.

Push jerk

A push press plus a 'press under', a second dip that drops you under the bar to receive it locked out in a partial squat; lets you move ~30% more than a push press.

Power zone

The core region athletic movement emanates from, made of the hip flexors, hip extensors (glutes and hams), spinal erectors, and quadriceps.

Core-to-extremity recruitment

The principle that sound athletic movement starts at the core and radiates outward to the limbs; violating it is the root of most movement faults.

Muted hip

A fault where the pelvis 'chases' the leg during hip flexion, killing the hip drive; the push press under load is used to expose and eliminate it.

Dip / drive

The short downward bend of hips and knees (dip) and the explosive upward extension that powers the bar (drive); the turnaround between them must be sudden and tight.

Press under

The second dip in the push jerk where you drop under the bar to receive it overhead with locked arms, rather than pressing it all the way up.

Midline stabilization

The abs' primary athletic job: bracing and keeping the trunk rigid (not flexing it), which is critical to driving loads overhead.

Coupling force with velocity

Producing strength fast, the essence of power and speed; the push press and jerk train it because they're performed explosively.

Key ideas to understand

• The deadlift is dead simple but unrivaled for building head-to-toe strength — it's just picking a thing off the ground done right.
• Its old name, 'the healthlift,' was the better name. Fear of the deadlift is groundless, same as fear of the squat.
• Whatever a client wants — rev up metabolism, more strength or lean mass, less body fat, a healthier back, better sport performance, or staying independent into old age — the deadlift is a shortcut to it.
• It belongs in the same family as standing, running, jumping, and throwing for functionality, but it pays off in athletic ability faster than anything else.
• Because of its whole-body nature and big mechanical advantage with heavy loads, it hits hard on the hormonal (neuroendocrine) side — athletes feel the strength and the sense of power quick.
• Want to get stronger? Drive your deadlift up. It tends to pull your other lifts up with it, especially the Olympic lifts.
• No other exercise protects the back from the injuries of sport and life and the wear of time like the deadlift does.
• Program it near-max about once a week, and maybe one other day at light loads for low reps. Be patient — learn to celebrate small, infrequent PRs.
• Benchmarks: a bodyweight deadlift is 'beginning,' twice bodyweight is 'good,' three times bodyweight is 'great.'
• Proper technique rests on three pillars: orthopedic safety, functionality, and mechanical advantage.
• We reject stances wider than hip-to-shoulder width — a super-wide (powerlifting) stance is less functional (you can't safely walk, clean, or snatch from out there) and piles more force on the hip. Use wide stances only rarely and light.
• Work all three grips over time — alternate, parallel, and hook — and carefully vary stance, grip width, even plate diameter, because each variant stresses the margins of the movement and builds hip capacity.
• The setup and pull cues all drive the same thing: a flat back, weight on the heels, bar close to the legs traveling straight up and down, and arms acting only as straps.
• Two things stay constant while the bar is below the knees: the torso's angle of inclination, and shoulders and hips rising at the same rate.
• The five-cue short version of the deadlift: look straight ahead, keep the back arched, arms don't pull (they're just straps), bar travels along the legs, push through the heels.
• The doctor-and-Coach conversation makes the point: even a frail, elderly client already sets a bag down and picks it back up in real life — our job is to teach her to do that essential activity safely, not to avoid it.
• The sumo deadlift high pull (SDHP) is a separate movement: a wide sumo stance, narrow grip, pull from mid-shin, drive with hips and legs to full extension, then shrug and pull the bar under the chin.
• On the SDHP the sequence matters — open the hip fully first, shrug, THEN pull with the arms, keeping the elbows high and above the hands.
• The SDHP is a great conjugate to the thruster (similar range of motion, line of action, speed), and at low loads it's the favorite substitute for Concept2 rowing.

Words to know (plain English)

Deadlift ('the healthlift')

The movement of lifting a loaded bar (or any object) off the ground to a standing position with a flat back, hips and legs doing the work. CrossFit treats it as the safe, sound way to pick anything up — its older name 'healthlift' fits better.

Neuroendocrine response

The hormonal reaction the body has to hard training. Big, whole-body lifts with heavy loads (like the deadlift) trigger a strong one, which drives strength and adaptation.

Orthopedic safety

Protecting the joints, spine, and connective tissue. One of the three pillars guiding deadlift technique — keep the load off the structures that get hurt.

Mechanical advantage

Setting up the body so leverage works for you instead of against you (bar close, back flat, weight on heels), letting you safely move bigger loads. The third pillar of proper deadlift technique.

Angle of inclination (torso angle)

How far the torso is leaned forward relative to the ground. In the deadlift it stays constant while the bar is below the knees — the back doesn't change angle as you start the pull.

Alternate / parallel / hook grip

Three ways to hold the bar. Parallel (both palms facing you / pronated), alternate (one palm forward, one back, the 'mixed' grip), and hook (thumb trapped under the fingers). Coaches rotate all three to build grip and stress the movement's margins.

Sumo deadlift high pull (SDHP)

A pulling movement from a wide ('sumo') stance with a narrow grip: drive the bar up with hips and legs to full extension, shrug, then pull with the arms (elbows high) to bring the bar under the chin.

Conjugate

A movement that closely matches another in range of motion, line of action, and speed, so it trains a similar quality. The SDHP is a conjugate to the thruster.

Line of action

The path the load travels through space during a movement. The SDHP shares a similar line of action with the thruster, which is why they pair well.

Key ideas to understand

• The Olympic lifts — clean and jerk and snatch — are the toughest learning challenge in all of weight training; outside them there are no truly complex movements in the weight room.
• By comparison, the average collegiate gymnast has learned hundreds of movements at least as complex as the clean or snatch — so 'too complex to learn' doesn't hold up; weight training is just usually too simple to prepare people for them.
• Many coaches avoid the quick lifts because of their technical complexity, but that complexity is exactly the source of their value: the lifts simultaneously demand AND develop strength, power, speed, flexibility, coordination, agility, balance, and accuracy.
• The people knocking the Olympic lifts usually have no real first-hand experience with them — nobody who actually knows the lifts can articulate why they'd be dangerous or off-limits for any population.
• At CrossFit, everyone learns the Olympic lifts — everyone.
• The Dynamax medicine ball is the teaching tool: a soft, large, pillowy ball, 4 to 30 lb in increments, nonthreatening and even friendly — which is the whole point.
• The teaching sequence with the ball: introduce the deadlift starting position and posture, then the deadlift itself, then shift to front squatting with the ball, then to the clean.
• Reduced to its essence, the clean becomes 'pop the hip and drop — catch it in a squat,' and the group is cleaning in about five minutes. It's a legitimate, functional clean.
• The med-ball clean may actually have clearer real-life application than the bar clean — it's the same pattern as heaving a bag of cement into a truck or hoisting a toddler into a car seat.
• Every fault common to lifting beginners shows up just as plainly with the ball as with the bar, so nothing important is lost by starting here.
• The standard faults to hunt: heels up in the first pull, back rounded, head down, arms bent, pulling too high, no hip extension, no shrug, curling the ball, and a low/slow catch with elbows down.
• The corrected starting position is heels down, head up, back arched; the catch correction is elbows high.
• The general clean corrections: arms locked, full extension, shrug, pull the body down under the ball, ball kept close to the body, and catch with elbows high.
• Load scales the stimulus inside one class: in a mixed group, newbies get light balls and veterans get heavy ones; whoever holds the 30-lb ball gets a real workout no matter their ability.
• A heavy med-ball clean hits harder than the same weight in a bar or dumbbell, because of the extra effort to adduct the arms and 'pinch' the ball so it doesn't slip.
• Use the med-ball clean in warm-ups and cool-downs to reinforce the movement — the payoff shows up as more and faster PRs in the bar clean, even for the better lifters. The benefit transfers to the bar.
• A warm-up is full of chances to weed out bad mechanics — pulling with the arms, not finishing hip extension, no shrug, pulling too high, lifting the heels, curling, losing back extension, looking down, catching high then squatting, slow drop, slow elbows — they're all on display.
• The 'follow the leader' drill: put athletes in a small circle, put the best clean in the center as the model, and have everyone mirror it in real time; out-of-sync bodies make screw-ups obvious.
• Mirroring kills 'paralysis through analysis' — thinking becomes doing. Athletes who ignore verbal cues become self-correcting by watching and comparing to others, and they even shout corrections to each other across the circle.
• Turning it into a child's game of 'follow the leader' cuts coaching cues down to the bare minimum — the model does the teaching.

Words to know (plain English)

Olympic lifts (quick lifts)

The clean and jerk and the snatch — the two competitive weightlifting movements that explosively move a load from the ground to overhead. CrossFit teaches them to everyone because they build power, speed, and coordination.

Clean

Explosively moving a load from the ground to the front of the shoulders, finishing by dropping under it into a front squat to catch. Reduced to 'pop the hip and drop — catch it in a squat.'

Dynamax medicine ball

A soft, large, pillowy weighted ball ranging from 4 to 30 lb in increments. Its nonthreatening feel makes it the ideal tool for teaching the clean and removing fear of the Olympic lifts.

Hip extension ('popping the hip')

Fully and forcefully opening the hips from bent to straight — the power source of the clean. 'No hip extension' or not finishing it is a top fault.

Shrug

Elevating the shoulders to continue the upward drive of the load after the hips open. A missing shrug is a common clean fault.

Catch (receiving position)

Where you receive the load at the shoulders after pulling under it. The fault is a low, slow catch; the correction is to catch with the elbows high.

Adduction (pinching the ball)

Squeezing the arms inward toward the body. With a heavy med-ball you must adduct to 'pinch' the ball so it doesn't slip, which makes it harder than the same weight on a bar.

Paralysis through analysis

When too much thinking or over-coaching freezes an athlete so they can't move well. The mirroring drill avoids it by turning thinking into doing.

Follow-the-leader (mirroring) drill

A teaching method: athletes form a circle around the best mover and copy them in real time. Out-of-sync bodies make faults obvious and athletes self-correct without much verbal coaching.

Key ideas to understand

• Core strength in CrossFit means one thing: midline stabilization. Picture a line that splits the spine down the middle and cuts the pelvis in half. Holding that line rigid, with no bending or deflection, is the whole game. Hold it solid and you move more efficiently and put out more power.
• That midline matters everywhere: the deadlift, the loaded squat, the shoulder press, and every sport. Any time the torso wobbles off that line, energy leaks out the side. A swimmer who twists, a fighter throwing a punch, a cyclist, a squatter all lose power to deflection.
• Most people are 'frontally fixated.' They train pecs, abs, and quads but ignore the rhomboids, the erectors, and the glute-hamstrings on the back side. The catch: the real horsepower for punching, jumping, throwing, and running comes from the posterior, not the front.
• Trying to keep the hip flexors out of training is a mistake. By their attachment points and leverage, the hip flexors have several times the contraction capacity of the abs. Midline stabilization needs all of it: hip extensors, hip flexors, trunk flexors, and trunk extensors. The abs are only one piece.
• Midline work is static control. You're trying NOT to let the spine-to-pelvis relationship move. Yet most common 'core' moves are dynamic, like the crunch, which is a deliberate bending of the trunk. When you deadlift, you deliberately hold that relationship locked.
• Lots of training communities do almost no hip extension, have almost no awareness of the spine-to-pelvis relationship, and limit hip flexion on purpose. The only 'core' work they do is dynamic trunk flexion (crunches). Many of those same communities have chronic back-injury problems, which is no coincidence. Run, pull-up, sit-up, push-up on repeat has no real core movement in it. The crunch does not count.
• The GHD is a bulky, space-hungry machine, but it's essential. CrossFit Santa Cruz ran four of them in 2,500 square feet. It's used for four exercises that build awareness and capacity at midline stabilization.
• The punchline: static contractions that stabilize the midsection are the most important and most powerful muscular contractions in that region. The L-sit, overhead squat, and deadlift get you somewhere no pile of crunches ever will.
• Why static can be so much stronger than dynamic: the guess is that if you could fire the abs dynamically with the same force you can hold them statically, you'd be able to break your own back at will. We're hardwired so we can't, which is protective.
• The four GHD movements are taught in a strict order, and the client earns each one by showing capacity in the one before it (about 25-30 clean consecutive reps).
• Movement 1, GHD hip extension: hinge at the hip ONLY, keeping the distance from xiphoid process (bottom of the breastbone) to pubic bone fixed. No trunk flexion, no shortening of the trunk. The erectors work statically to hold the line; the glutes and hamstrings do the moving (concentric and eccentric). Set the pad so the femur is on the pad and the pelvis is free. Trap the pelvis and the athlete can't hold the lumbar curve.
• GHD hip extension is exceptionally safe and genuinely rehabilitative for the lower back. Even people with near-acute low-back issues can do it as long as there's no trunk flexion. Hit 25-30 reps without momentum and they'll usually feel real relief. It's a milder dose to the low back than even a moderate deadlift. Air squat plus a light deadlift plus this movement makes a great starting point for any client, any age.
• Movement 2, GHD back extension: adjust the pad UNDER the pelvis. Now the athlete deliberately gives up the lumbar curve, flexing and extending the trunk. The erectors work dynamically; the glutes and hamstrings now hold static (isometric). Controlled reps, no bouncing or flopping, done unloaded at first. Earn it with 25-30 clean reps.
• Movement 3, hip-and-back extension: pad goes back to the hip-extension setting. From the bottom (spine extended, hip fully flexed), the pelvis lifts first, then a wave of contraction rolls 'south to north' from lumbar all the way to the cervical spine, finishing with a rhomboid pull-back at the top. It starts with a powerful, dynamic glute-hamstring drive that extends the hip.
• The hip-and-back extension does a lot for a coach. It builds neurological awareness and lets you teach the client the vocabulary: hip flexion, trunk flexion, hip extension, trunk extension. If you can't name those and get the right response, you're nearly worthless with a client, so teach the terms early. The movement itself is a four-way 'snake' combo: hip flexion, hip extension, trunk flexion, trunk extension, all under control.
• Movement 4, the GHD sit-up: set the pad so the pelvis is free. The athlete descends back to touch the ground, then comes back to seated. It involves NO trunk flexion. Critics have called it 'pure hip flexion, no abs in that.' What the abs are actually doing here is midline stabilization.
• Earn the GHD sit-up only after demonstrating the hip extension, back extension, and hip-and-back extension. Even then, start with a SHORTENED range of motion and the trainer spotting behind. That might be the whole first dose. See how they respond, then add range and volume as capacity allows.
• How to do a GHD sit-up right: there's some leg flexion on the way down, then the leg extends dramatically to pull the athlete to seated. If the athlete does NOT extend the leg, they're relying mostly on the psoas alone, which is a weak, dysfunctional pull. Straightening the leg recruits the full hip-flexor complement, especially the rectus femoris.
• The anatomy of why leg extension matters: the psoas runs off the femur, through the pelvis without attaching, up to the lumbar spine. The rectus femoris (the big middle piece of the quad) is a powerful partner. It doesn't reach the lumbar spine but attaches to the pelvis, a spot of huge leverage. To fully fire it, the leg has to extend hard, because the rectus femoris is both a leg extensor and a hip flexor.
• Using only a fraction of the muscles meant to move a joint (psoas alone) is unnatural and a little irritating to the low back because of the shearing force on the lumbar spine. Done right, with the leg extending, the movement is not irritating. Teaching a client to extend the leg and use the full hip-flexor complement is how you push the point where irritation starts from 3 reps to 4 to 10 and beyond. That's rehabilitation, that's neuromuscular re-education.
• The AbMat sit-up is the complement to the GHD sit-up: dynamic in the trunk, static in the hip. You deliberately take the hip flexors OUT and work the torso. Fat part of the AbMat toward the glutes, soles of the feet together with knees butterflied. That position makes the hip flexors tangential to the line of action so they can't do productive work. Then the athlete comes up slowly and under control by contracting the abs.
• As the athlete fails on the AbMat, have them adduct and extend the legs a bit. That gives the hip flexors purchase and brings them back into the line of action, so the athlete can modulate the assistance and keep each rep on the midsection.
• Why a sit-up is 'defective' without the AbMat: done slowly and deliberately, most people fail a ground sit-up. That's not weakness or neuromuscular failure, the movement is just broken without the pad. To move, you have to push against something immovable. When the rectus fully contracts, the low back goes flat, but that isn't enough to bring you to seated.
• The lumbar spine only has a very short range of safe flexion, by design, each vertebra moves a little, and together they add up. That available range only takes you from spinally extended to neutral, and that's not enough to sit up. Fill the gap between the low back and the floor with the AbMat and now you have something to curl against, so you reach seated.
• Without the AbMat the sit-up becomes a two-phase (biphasic) movement: the upper rectus works where there's a fulcrum and flattens the back, then it throws the load to the hip flexors, which actually pull you to seated. The result is that the full rectus gets almost no load, only motion. There's no number of ground sit-ups that will work the rectus from pubic bone to a few inches above the belly button under load. The AbMat is what loads that motion.
• The bottom line on loading: how big would your bench get if you only pushed air? Without the pad the ab fibers shorten but there's no load and no real work done. With the pad you get the same range of motion but under load, so you actually develop strength.
• Together the two sit-ups complement each other beautifully: GHD sit-up is dynamic in the hips and static in the trunk; AbMat sit-up is dynamic in the trunk and static in the hip. Add the L-sit (static in both the trunk and hip) and you build a formidable, complete midline.

Words to know (plain English)

Midline stabilization

CrossFit's definition of core strength: keeping the line that splits the spine and pelvis rigid with no deflection while you move or hold a load.

Posterior chain

The muscles on the back side of the body, the glutes, hamstrings, erectors, and rhomboids, that drive jumping, throwing, running, and lifting.

Static contraction

Muscle firing to hold a position without moving the joint (like holding the spine locked in a deadlift), as opposed to a dynamic contraction that bends a joint.

Erectors (erector spinae)

The long muscles running along the spine that extend the back and, in midline work, hold the spine rigid.

Xiphoid process

The small tip at the bottom of the breastbone; keeping the distance from here to the pubic bone fixed means the trunk isn't shortening or flexing.

Lumbar curve

The natural inward arch of the lower back; holding it is the goal in hip extensions, surrendering it is deliberate in back extensions.

Concentric / eccentric

Concentric = a muscle shortening as it works (lifting up); eccentric = a muscle lengthening under control (lowering down).

GHD hip extension

The first GHD movement: hinge at the hip only, trunk stays rigid, glutes and hamstrings move you. Safe and rehabilitative for the low back.

GHD back extension

Pad set under the pelvis; the athlete deliberately flexes and extends the trunk so the erectors work dynamically and the glutes/hams hold static.

Hip-and-back extension

A combined 'snake' move: hip extends first, then a wave of trunk extension rolls up the spine from lumbar to cervical, finishing with a rhomboid pull-back.

GHD sit-up

A sit-up with no trunk flexion: descend to touch the ground, then extend the leg dramatically to pull to seated. The abs work as stabilizers.

AbMat sit-up

A trunk-flexion sit-up done over an AbMat with feet together and knees butterflied so the hip flexors are removed and the abs work under load through a real range of motion.

Psoas

A deep hip flexor that runs from the femur through the pelvis to the lumbar spine; pulling from it alone is a weak, dysfunctional, low-back-irritating way to sit up.

Rectus femoris

The big central quad muscle and a powerful hip flexor that attaches to the pelvis; fully recruited only when the leg extends hard, which makes the GHD sit-up strong and safe.

L-sit

A static hold (legs out front, body supported on the hands) that trains the midline static in both the trunk and the hip; rounds out the two sit-ups.

Tangential to the line of action

Positioned so a muscle's pull no longer lines up with the movement, so it can't contribute force, which is how the AbMat setup sidelines the hip flexors.

Key ideas to understand

• Earning your CF-L1 is the FIRST step in training others, not the finish line. The Level 1 Course is a broad survey of the methodology and movements; this article is the roadmap for what comes after.
• The credential basics: passing the Level 1 test earns you the CrossFit Level 1 Trainer (CF-L1) designation, usable on a resume or bio, valid five years. Keep it current by retaking the course every five years (or sooner) or by pursuing higher credentials.
• Coaching mastery mirrors the athlete's pursuit of virtuosity — 'doing the common uncommonly well.' Master coaches have an unmatched ability to improve others' fitness, and true mastery is a lifetime commitment; great coaches never consider themselves finished.
• An effective trainer needs capacity across SIX abilities: teaching, seeing, correcting, group/gym management, presence and attitude, and demonstration.
• Think of the six abilities the way you think of the 10 general physical skills: balanced capacity across all of them beats lopsided excellence in one or two. The more effective the trainer, the higher the capacity in EACH. These six are the focus of the Level 2 Course.
• Teaching = clearly articulating and teaching the mechanics of each movement. That includes hitting major points of performance before subtle ones and adjusting your instruction to the athlete's needs and capacity.
• Good teaching reflects both your knowledge AND your ability to communicate it. You have to understand what proper mechanics are and what causes bad movement — which takes continual study across every field that intersects with fitness.
• A great teacher relates to every student regardless of background, distills a large body of knowledge down to the one or few points that matter right now, and takes OWNERSHIP when communication breaks down. The more channels you use — verbal, visual, tactile, varied examples and analogies — the more likely the athlete succeeds.
• Seeing = discerning good from poor mechanics and spotting faults, gross and subtle, whether the athlete is moving or static. It requires knowing WHEN and WHERE to look (e.g., trunk-to-femur for hip extension, center of pressure for posterior-chain engagement) and knowing the difference between good and bad positions. Newer coaches struggle most with spotting faults while the athlete is MOVING.
• Correcting = facilitating better mechanics with visual, verbal, and/or tactile cues, including the ability to triage (prioritize) faults and understand how multiple faults relate. Correcting rests on four things: using successful cues, knowing multiple corrections per fault, triaging, and balancing critique with praise.
• A 'good' cue is defined ONLY by its result — any cue that improves mechanics is good. There's no required formula or format. That said, short, specific, actionable cues ('push the hips back') tend to land best, and you need multiple strategies per fault because different clients respond differently to the same cue.
• When several faults appear at once, attack them ONE at a time in order of importance. The order depends on the severity of the deviation and the athlete's capacity relative to the task — no single fault order works across all athletes and movements.
• Celebrate small wins, even just hard work. Acknowledging effort — especially when it isn't immediately successful — builds rapport throughout the cueing process.
• Seeing and correcting are exactly where newer trainers tend to be weakest. Good coaches relentlessly watch movement with a critical eye, constantly asking: How could this person be more efficient and safe? What cue would produce a better position? How do I deliver it for the best response? Develop that eye by working with great trainers and by filming yourself, other athletes, or classes.
• Group management = organizing and managing at the micro level (within a class) and the macro level (the whole gym): managing time, organizing space, equipment, and people for good flow, and planning ahead.
• The point of group management is to cut logistical setup and prep time so you maximize teaching and movement time — plan instruction ahead, pre-arrange equipment and weights, and don't burn the clock talking when athletes could be moving.
• Build practice time into every class; it serves both of you. It gives you time to observe and cue, and gives the client time to work on form. Every student should feel personally coached within the group — honestly assess after each session how much time and attention each client got. The goal is to maximize your effectiveness AND your reach.
• Presence and attitude = creating a positive, engaging learning environment with empathy and rapport. It's more intangible than the others, but clients feel its absence immediately. 'Positive' doesn't mean fake or forced — be authentic.
• Care, empathy, and a passion for service mark trainers with strong presence. Clients perceive that you care faster than they perceive your ability to explain mechanics, anatomy, or nutrition — and it's your job to figure out how to relate to and motivate each individual toward their goals.
• Demonstration = giving athletes an accurate visual example of the movement, and leading by example. It takes strong awareness of your own mechanics; if you're physically limited, it's fine to use someone else to demo — a coach with a good eye can quickly find a suitable model.
• Demonstration goes beyond a single class. Leading by example means holding yourself to the same range-of-motion standards as your clients, following your own programming and nutrition advice, and modeling the supportive attitude you want to see.
• Knowing the six qualities is simple; demonstrating them all at once in a live group is the hard part. A commitment to improving each area is the hallmark of a successful trainer at ANY level of current proficiency — coaching skill is refined across a whole career, which is how you develop virtuosity in coaching.
• Coach Glassman's 'novice's curse': the compelling tendency among novices in any skill or art to rush past the fundamentals toward more elaborate, sophisticated techniques — the rush to originality and risk. The roadmap that follows is the antidote.
• To DEVELOP as a trainer, keep refining your knowledge to stay ahead of your athletes. If your clients aren't testing the limits of your knowledge, you aren't doing a good enough job with them. A great coach is proud when a student exceeds them but stays ahead by growing, not by holding the athlete back.
• Eight concrete ways to develop: (1) Teach to learn — experience in a dynamic environment is the only way to gain competency, even if your first clients are friends and family; academics (biochem, anatomy, teaching methods) support but don't replace it. (2) Watch more experienced coaches in any discipline — watch what they watch and when, listen to their cues, study their rapport. (3) Film yourself coaching to slow down the footage and self-assess against the six criteria. (4) Attend a Level 2 Course to work on seeing and correcting in front of peers and get practical, six-criteria feedback. (5) Attend additional/specialty courses — focus on WHY different methods fit different applications. (6) Read and study everything related to training, movement, and health. (7) Study and follow CrossFit.com — the archives since 2001 are a programming resource; the challenge is to follow CrossFit.com for at least six months to learn variance, volume, and scaling. (8) Pursue higher credentials — Level 2, Certified CrossFit Trainer (Level 3), Certified CrossFit Coach (Level 4, the preeminent designation).
• CrossFit also offers online courses (e.g., Scaling, Spot the Flaw) and, under its Certification branch, courses like anatomy and physiology and best business practices — usable for continuing-education credits and open to anyone.
• Three principles guide trainers at ALL levels while gaining expertise: master the fundamentals, limit the scope, and pursue excellence.
• Master the fundamentals: new athletes succeed by adhering to mechanics, then consistency, then intensity — and the coach manages the timeline to intensity. Don't think new clients need complex movements and high volume to be 'sold' on you. Insist on consistently safe, correct mechanics, then very gradually add load and volume while watching for faults — this both cuts injury risk and sets up long-term success.
• Intensity is a Goldilocks problem: too much too soon risks injury and long-term inefficiencies; too little or none blunts the adaptation that only intensity drives. When in doubt, err on the side of caution and progress slowly — even low-intensity varied functional movement helps, and it becomes clear over time when to add intensity.
• Limit the scope: the group-class model is hard for a novice because teaching and class management steal attention from seeing and correcting. New trainers should coach friends/family in one-on-one or small groups (two or three) to perfect their correction skills before big classes, or assist a head coach. Seek internships or assistant roles, and grow class size GRADUALLY — Glassman's 'Scaling Professional Training' makes the point that the skill of making every group member feel individually coached was developed only by migrating gradually from one-on-one to groups.
• There's a ceiling on quality output, too: even in Santa Cruz, about five appointments a day was the max before an unacceptable drop in energy, focus, and professional standards.
• Limiting the scope also means admitting when you don't know something. Don't make up answers beyond your knowledge or scope of practice — about anatomy, back pain, or why sugar harms health. Work within your knowledge to protect clients and build credibility, build a referral network of other professionals, keep seeking answers, and ALWAYS refer any medical condition to a physician.
• Pursue excellence: CrossFit's recommended 'business model' is the relentless pursuit of excellence — build a model focused on making the training (and the clients) better, not on chasing money. Achieve excellence and let the market bring the money to you. Cut through analysis paralysis with one question: 'Will it improve the quality of the programming or the training experience?' If yes, you're pursuing excellence.
• Community and representation: the L1 formalizes your place in the CrossFit community and transmits its ethos — camaraderie, humility, hard work, and service. Along with affiliates, L1 Trainers are the community's most important ambassadors, and CF-L1 is the first step toward affiliation (a 13,000+ affiliate community). It's the daily work of constantly varied functional movement at high intensity plus the meat-and-vegetables/nuts-and-seeds/some-fruit/little-starch/no-sugar diet that reverses chronic disease and improves lives.
• Use this material the right way: take what you learned, apply it slowly to others, and incrementally widen your scope over time. That continued development is what eventually leads to coaching virtuosity. Feedback is welcomed at coursefeedback@crossfit.com.

Words to know (plain English)

CrossFit Level 1 Trainer (CF-L1)

The designation earned by participating in the Level 1 Certificate Course and passing the test. Usable on a resume, bio, or business card; valid for five years.

Virtuosity (in coaching)

'Doing the common uncommonly well.' Applied to coaching, it's the mastery of improving others' fitness — pursued across a whole career and never considered finished.

The six abilities of an effective trainer

Teaching, seeing, correcting, group/gym management, presence and attitude, and demonstration. An effective trainer needs balanced capacity in all six; they are the focus of the Level 2 Course.

Teaching

Clearly articulating and teaching the mechanics of each movement — hitting major points of performance before subtle ones and adjusting instruction to the athlete's needs and capacity.

Seeing

Discerning good from poor mechanics and identifying gross and subtle faults, whether the athlete is moving or static — knowing when and where to look.

Correcting

Facilitating better mechanics with visual, verbal, and/or tactile cues, including triaging faults by importance and understanding how multiple faults relate.

Cue

A prompt (verbal, visual, or tactile) used to improve movement. A 'good' cue is defined only by its result; short, specific, actionable cues tend to work best.

Triage (of faults)

Prioritizing which fault to correct first, one at a time, based on the severity of the deviation and the athlete's capacity relative to the task — no single order works for everyone.

Group/gym management

Organizing and managing at the micro (class) and macro (gym) levels — time, space, equipment, and people — to maximize teaching and movement time.

Presence and attitude

Creating an authentic, positive, engaging learning environment built on empathy, care, and rapport — felt by clients before expertise is.

Demonstration

Providing an accurate visual example of a movement and leading by example (same ROM standards, own programming and nutrition, supportive attitude); a model may be used if the trainer is physically limited.

Novice's curse

Coach Glassman's term for the tendency to rush past the fundamentals toward more elaborate techniques — 'the rush to originality and risk.'

Progressive scaling principles for new coaches

Master the fundamentals (mechanics → consistency → intensity), limit the scope (small groups first, grow gradually, admit what you don't know), and pursue excellence (build around better training, not money).

Affiliation

Licensing the CrossFit name to market services. CF-L1 is the first step toward it; the credential alone does not allow marketing services under the CrossFit name.

CrossFit credential ladder

CF-L1, then CrossFit Level 2 Trainer, then Certified CrossFit Trainer (Level 3), then Certified CrossFit Coach (Level 4) — the preeminent trainer designation.

Key ideas to understand

• Being an expert coach isn't just knowing points of performance and correcting faults — client safety also covers programming, special populations, equipment layout, and accurate representation of your credentials. This article primes new L1 Trainers to train responsibly while gaining expertise.
• Rhabdomyolysis ('rhabdo') is rare but real: high-intensity or high-volume exercise (CrossFit or anything that damages muscle cells) can break muscle tissue down and dump the cells' contents into the bloodstream. That can damage the kidneys and, in rare cases, cause renal failure or death.
• How rhabdo is diagnosed and treated: it's diagnosed when a patient with the right history shows elevated creatine kinase (CK/CPK) — CPK is easier to measure than myoglobin and is used as the marker, even though it's the myoglobin that actually does the damage. Treatment is generous IV fluids to flush myoglobin through the kidneys; severe cases may need dialysis; death (rare) comes from electrolyte imbalances triggering cardiac arrhythmias. Most people fully recover after IV rehydration over hours to a week.
• Five ways to protect athletes from rhabdo: follow the mechanics-consistency-intensity charter; know the movements with higher rhabdo incidence (those that prolong the eccentric contraction) and watch their programmed volume; scale workouts appropriately; avoid progressive scaling; and educate clients on the symptoms and when to seek care.
• Why the charter protects against rhabdo: slow, gradual increases in intensity and volume let the body acclimate. Even athletes who quickly show sound mechanics still need that gradual ramp. With new athletes, use modest loads, reduce volume, and coach technique.
• Scale beyond the on-ramp. At gyms with 'elements'/'on-ramp' classes lasting a couple weeks, keep athletes heavily scaled even AFTER that intro period. If there are no beginner classes, treat workouts as technique sessions for newer athletes — mechanics over speed or load.
• There's no fixed protocol for ramping intensity — err on caution and work toward long-term fitness. Multiple MONTHS at scaled loads and volumes is normal even for the best athletes, with gradual increases after that. Check in frequently to see how the last dose of exercise affected each athlete; everyone has their whole life to keep improving.
• Know the higher-incidence movements. Beginners should keep 'negatives' (movements that prolong the eccentric phase) to a minimum — negatives build strength but shouldn't be high-volume for beginners; volume can climb gradually over time.
• The two CrossFit movements most prone to a prolonged eccentric: jumping pull-ups and full-range-of-motion GHD sit-ups. In the jumping pull-up, don't ride the descent — drop immediately to extended arms once the chin clears the bar and absorb impact with the legs. In the GHD sit-up, newer athletes should use fewer reps and possibly a shortened range until capacity is built.
• Scale the GHD even for experienced athletes who don't use it routinely. There are no exact volume rules, but beginners, new athletes, and even advanced athletes who haven't been on the GHD regularly should start with relatively low reps of the PARTIAL-range (to parallel) GHD sit-up and build from there with consistent exposure.
• Avoid progressive scaling with beginners and intermediates. Progressive scaling = continually adjusting a workout's difficulty so an exhausted athlete keeps moving (e.g., dropping a 135-lb. thruster to 115 to 95 to 65 to 45 across the workout). Instead, let these athletes STOP and rest as needed to finish. Progressive scaling can be used, but only very cautiously and even then only with the most advanced athletes.
• Educate athletes about rhabdo — the risk, the reduction strategies, and the symptoms — so they understand WHY you scale, especially when they're eager to go 'Rx'd.'
• Outside factors raise rhabdo risk: alcohol and drug use (avoid heavy drinking, especially near training) and certain medications, including statins (cholesterol-lowering drugs).
• Rhabdo symptoms: severe generalized muscle pain, nausea and vomiting, abdominal cramping, and in severe cases dark-red or cola-colored urine (the color is myoglobin — the same molecule that makes red meat red). If these appear after a workout — or dark-red urine at ANY time — seek medical attention immediately.
• Counterintuitive risk profile: the highest-risk athletes are those with a reasonable baseline fitness from non-CrossFit training, those returning after a layoff, or experienced athletes who spike volume/intensity well outside their norm — they have the muscle mass and conditioning to generate enough intensity to hurt themselves. The most deconditioned are at LESS risk (not zero) because they likely can't generate that intensity yet. Either way, scale and focus on mechanics with every client.
• Equipment safety has three parts: condition (installation + day-to-day maintenance), arrangement (layout), and the human factors of spotting and bailing. Installation (pull-up rigs, hanging rings, assembling a GHD) should use professional help when the owner is inexperienced.
• Load-bearing gear must be over-built and tested. Pull-up rigs, rings, and straps should be designed to bear FAR more than the expected max load and tested at maximum loading before regular client use.
• Maintenance is paramount and ongoing. Gear that lifts feet off the ground or inverts athletes needs extra attention. Straps, racks, bars, and locking mechanisms must be kept working and checked regularly for wear; dumbbells, kettlebells, and barbells need inspection where handles or collars could come apart. Repair, replace, or pull faulty equipment immediately.
• Arrangement = the layout of equipment and athletes. Each athlete needs enough space for the movements PLUS a buffer for errant equipment, missed attempts, and safe passage of coaches and other athletes. Never let spare bars, plates, or boxes lie around the workout area — they trip athletes or cause ricochets.
• Plan for falls in dynamic movements. An athlete can lose grip during a kip (pull-up or muscle-up). Wrapping thumbs around the bar can add feedback but isn't foolproof and can be less secure for small hands — and it doesn't replace the athlete developing body awareness of when to bail. (Wrapping thumbs is always recommended for barbell and ring movements for balance and control, especially higher-risk ones like a bench press or muscle-up.) Keep boxes and racks from under, behind, or directly in front of these athletes; lower adjustable rings to the right height; place assistance boxes to the SIDE (out of others' way) to leave a clear exit.
• The 'dry run' is the safety tool for arrangement: walk through the workout before it starts — check each athlete's space for each proposed movement, rotate stations on your call, verify spacing, and have participants return to the same spot during the workout.
• Teach bailing and spotting before loading up. In most weightlifting movements, athletes only need to learn to bail safely — teach it and let them practice before any significant load, and keep enough empty space around them to prevent ricochets.
• Spotting rules for weightlifting: spotting is NOT recommended except for a bench press (where it's mandatory) and possibly a back squat (especially low-bar). Don't assume athletes know how to spot — instruction and practice at lighter loads are required.
• Spotting rules for gymnastics: experienced trainers/athletes may spot gymnastics movements in a way that minimizes risk to both parties. Generally spot at the torso or hips for support, but the hips or legs can work (e.g., handstands). The spotter can be to the REAR when the risk of getting hit is low (ring support, GHD sit-up), but a position BESIDE the athlete is often best (e.g., handstand).
• Have a blood plan. Clean equipment regularly to reduce infection; stage proper disinfectants/sterilizers and clean cloths near the floor to wipe blood off bars immediately. A blood-spill cleanup procedure is in the CrossFit Journal archives.
• Monitor athletes for conditions that need medical attention. Even though your main job is instruction, watch exertion levels — CrossFit's high intensity pushes athletes to their physical and psychological tolerances, and environmental factors can make things worse.
• Heat is the big environmental risk. In unseasonably hot, humid weather have plenty of water ready and watch for overexertion signs (e.g., dizziness). Heat raises rhabdo risk (though some cases occur in cold climates). For a potential heat stroke after a workout (e.g., altered mental state), remove excess clothing and douse the athlete with cool water BEFORE medical help arrives.
• Refer other red-flag symptoms: numbness or chronic joint/muscle pain goes to medical professionals; any non-responsive athlete needs medical attention immediately.
• Be emergency-ready. Get trained in CPR and AED use and keep an AED at the gym — most states require this by law, and trainers/affiliates should comply with all state laws. CPR/AED credentials typically last one to two years (Red Cross, American Heart Association) — keep them current.
• Hydration, in one line: drink when thirsty, don't when you're not. CrossFit advises AGAINST rehydration strategies that push fluids to prevent body-weight loss during activity — dehydration during exercise is a normal physiological process, and the thirst mechanism is enough to regulate hydration and serum sodium during exercise.
• Overdrinking is the real danger, not under-drinking. Drinking beyond thirst to prevent weight loss offers no health or performance benefit and risks exercise-associated hyponatremia (EAH) — a potentially deadly dilution of the body's serum sodium, caused by overconsuming fluid. It's essentially iatrogenic (caused by the very advice to 'drink as much as tolerable').
• Sports drinks don't protect against EAH. Electrolyte-enhanced sports drinks do NOT reduce hyponatremia risk; because of flavoring and sugar they may actually drive MORE overconsumption than water alone, raising EAH risk.
• Special populations need physician clearance. Anyone with a medical condition must be cleared by a physician before you recommend a regimen. A medical-history form helps you spot issues, and you should ask about medical status and know common conditions that need clearance (e.g., diabetes, prescription medications).
• Pregnant athletes: still get medical clearance and the physician's guidelines once the condition is known. Be especially mindful of reducing fall risk (box jumps, rope climbs) and watch for complaints of calf pain or swelling, which can signal more serious issues. (CrossFit Journal has scaling resources, e.g., 'Pregnancy: A Practical Guide for Scaling.')
• Post-surgery athletes: workouts are scalable and many recover well staying active, but seek clearance from the SURGEON before restarting a regimen.
• Know your scope of practice: you can promote anyone's desire to exercise and give direction, but that does NOT extend to diagnosing or treating any medical condition.
• Use the credential legally. Passing the L1 earns the 'CrossFit Level 1 Trainer' designation (abbreviated 'CF-L1 Trainer'), a title approved by ANSI (the third party through which the course is accredited).
• Two musts for the credential: use the correct terminology, and act in accordance with the Level 1 Trainer Certificate License Agreement (signed when you get your test results).
• 'Certificate' vs. 'certification' — and never say 'certified.' A CF-L1 holds the Level 1 CERTIFICATE (valid five years; see the Participant Handbook for maintaining active status; the public Trainer Directory verifies credentials). Don't use 'Level 1 Certified' — it misrepresents the credential and isn't endorsed by CrossFit. A 'Certificate Course' has learning objectives, a training component, and a test tied to those objectives; a 'certification' (Certified CrossFit Trainer/Coach) is a test only, no educational component, prepared on the applicant's own time, designed to assess competency across a whole profession. A certification generally demonstrates greater professional competency than a certificate.
• What the credential lets you do — and not do. CF-L1 may sit next to your name like other educational credentials (M.S., R.N., D.C.) and go on a website bio or business card. It does NOT let you use the 'CrossFit' name to market services (personal CrossFit training, CrossFit classes). You can use the CrossFit METHOD to train yourself, friends, and family for free, but to use the CrossFit name or logo (the brand) to advertise, market, promote, or solicit, you must affiliate (license the CrossFit name).
• Bottom line: the risk-to-benefit ratio for CrossFit participants is very low — but keeping it low is the trainer's responsibility, and this guidance is the resource for doing it.

Words to know (plain English)

Rhabdomyolysis ('rhabdo')

A rare but serious condition where muscle tissue breaks down and releases the cells' contents into the bloodstream, which can damage the kidneys and, in rare cases, cause renal failure or death.

Creatine kinase (CK / CPK)

An enzyme used as the diagnostic marker for rhabdo because it's easy to measure in blood; an elevated level in a patient with the right history indicates rhabdo — though it's the myoglobin that actually damages the kidneys.

Myoglobin

The muscle protein released during rhabdo that damages the kidneys and colors dark-red/cola-colored urine; it's the same molecule that gives red meat its color.

Eccentric phase / 'negatives'

The lengthening (lowering) phase of a contraction. 'Negatives' are movements that prolong this phase; they build strength but raise rhabdo risk and should be low-volume for beginners. Jumping pull-ups and full-range GHD sit-ups are the common culprits.

Progressive scaling

Continually lowering a workout's difficulty mid-workout (e.g., dropping the thruster load step by step) so an exhausted athlete keeps moving. To be avoided with beginners and intermediates; used only very cautiously with the most advanced athletes.

On-ramp / 'elements' classes

Introductory classes (often a couple of weeks) for beginners. Athletes should still be heavily scaled even AFTER this intro period.

Exercise-associated hyponatremia (EAH)

A potentially deadly dilution of the body's serum sodium caused by overconsumption of fluid (drinking beyond thirst). Essentially iatrogenic — driven by the 'drink as much as tolerable' belief; sports drinks don't reduce the risk and may worsen it.

Iatrogenic

Caused by medical or health advice/treatment itself. EAH is described as iatrogenic because it stems from the prevailing advice to over-hydrate during exercise.

Bailing

Safely ditching a lift when it can't be completed. Athletes must be taught and allowed to practice bailing before any significant load is lifted, with enough empty space to avoid ricochets.

Spotting

Physically assisting an athlete during a movement. Not recommended for most weightlifting except the bench press (mandatory) and possibly the back squat; gymnastics spots are placed to minimize risk to both people (often beside the athlete).

AED (automatic external defibrillator)

A device for cardiac emergencies. Trainers should be CPR/AED trained (credentials renewed every one to two years) and keep an AED at the gym, as most states require by law.

Scope of practice

The boundary of what a trainer may do: promote a person's desire to exercise and provide direction — but NOT diagnose or treat any medical condition.

CrossFit Level 1 Trainer (CF-L1 Trainer)

The ANSI-approved designation earned by passing the Level 1 course. The holder has the Level 1 CERTIFICATE (valid five years) — never 'Level 1 Certified.'

Certificate vs. certification

A Certificate Course (like Level 1) has learning objectives, a training component, and a test tied to those objectives. A certification (Certified CrossFit Trainer/Coach) is a test only with no educational component, designed to assess competency across a whole profession.

Affiliation

Licensing the CrossFit name/logo to market services. The CF-L1 lets you use the CrossFit METHOD with yourself, friends, and family for free, but you must affiliate to advertise or market under the CrossFit brand.

Key ideas to understand

• The gymnastics scoring analogy sets it up: a flawless routine only earns a 9.7, not a perfect 10.0. The last three tenths come from 'risk, originality, and virtuosity' on top of error-free execution.
• Risk is performing a movement likely to be missed or botched. Originality is a movement or combination unique to the athlete — something not seen before.
• Novices love risk and originality because they're dramatic, fun, and impressive — especially to the athletes themselves (audiences often don't even notice).
• Virtuosity is a different beast: defined in gymnastics as 'performing the common uncommonly well.' It's supremely elusive, but instantly recognized by audience, coaches, and athletes alike — and it's always the mark of true mastery (and of genius and beauty).
• The novice's curse: in any skill or art — violin, poetry, gymnastics — there's a strong pull to rush past the fundamentals toward elaborate, sophisticated movements. That rush to originality and risk is the curse.
• The novice's curse shows up as excessive adornment, silly creativity, weak fundamentals, and ultimately a marked lack of virtuosity and delayed mastery.
• Being taught by the very best in any field is usually surprising for how simple, fundamental, and basic the instruction is.
• The curse afflicts the teacher as much as the learner — and physical training is no different.
• What dooms a training program and dilutes a coach's efficacy is a lack of commitment to fundamentals — Glassman says this is increasingly common in both programming and supervising execution.
• The symptoms he sees: the short, intense couplets and triplets that epitomize CrossFit are rarely prescribed anymore, and trainers rarely really nitpick the mechanics of fundamental movements.
• He understands the temptation: it's natural to want to teach advanced, fancy movements to entertain and impress the client. But make no mistake — it's a sucker's move.
• Teaching a snatch before there's an overhead squat, or an overhead squat before there's an air squat, is a colossal mistake. The rush to advancement increases injury risk, delays progress, blunts the client's return on effort — in short, it retards his fitness.
• The counterintuitive payoff: if you really insist on basics, clients will immediately recognize you as a master trainer. They won't be bored — they'll be awed, and they'll come to recognize the potency of fundamentals.
• Clients grounded in basics also advance faster in every measurable way than those without a teacher committed to fundamentals — and the coach will appear more experienced, more professional, and earn more respect just by recommitting to basics.
• There's plenty of time in a one-hour session to warm up, practice a basic movement or skill or chase a PR/max lift, discuss and critique the athletes' efforts, and then pound out a tight couplet or triplet — or just play.
• Play matters — tire flipping, basketball, relay races, tag, Hoover-ball — it's essential to good programming, but it's seasoning (salt, pepper, oregano), not the main course.
• CrossFit trainers have the tools to be the best trainers on Earth — but 'good enough never is.' The goal is that last tenth of a point, the whole 10.0: virtuosity.

Words to know (plain English)

Virtuosity

Performing the common uncommonly well — doing the basic, ordinary movements at an extraordinary level. It's the true mark of mastery, and the whole point of this letter.

Risk (gymnastics)

Performing a movement that's likely to be missed or botched. Dramatic and impressive, but one of the things novices over-reach for instead of mastering basics.

Originality (gymnastics)

A movement or combination unique to the athlete — something not seen before. Like risk, it's flashy and tempting but not a substitute for virtuosity.

The novice's curse

The strong pull — in any skill — to rush past the fundamentals toward elaborate, advanced, impressive movements. It produces weak fundamentals and delays mastery, and it affects coaches as well as students.

Fundamentals

The basic movements and mechanics that everything advanced is built on (e.g., air squat before overhead squat before snatch). Relentless commitment to them is the mark of a master coach.

Couplet / triplet

A short, intense workout built from two (couplet) or three (triplet) movements. Glassman names these as epitomizing CrossFit programming — and warns they're prescribed too rarely now.

Efficacy (of a coach)

How effective a coach actually is at producing results in clients. It gets diluted by a lack of commitment to fundamentals.

Play (as seasoning)

Games like tire flipping, basketball, relays, tag, and Hoover-ball. Essential to good programming for fun and variety, but a flavoring on top of the basics — not the main course.

Key ideas to understand

• The professional's identity: being a fitness trainer is a passion, not just a job, with clients as the top priority and their successes as the trainer's life's work. On the surface the job is to move clients toward physical prowess, but it carries a purpose that transcends the physical. Training is a physical metaphor for the habits and attitudes that drive success everywhere.
• The lessons of physical training are unavoidable and universally applicable: perseverance, industry, sacrifice, self-control, integrity, honesty, and commitment are best and most easily learned in the gym. Even clients already successful in business, sport, war, or love find their most important values reinforced and refined through rigorous training. You know you've succeeded only when clients bring back concrete examples of this carrying over.
• Competency is determined solely by efficacy. Your methods must be second to none, which makes fitness trends and fashions distractions, not attractions. To the extent your methods are unconventional, unaccepted, or unique, that's the margin by which you dominate your industry, and a trainer who lusts for popular approval is chasing mediocrity or worse.
• Commitment to unrivaled efficacy forces you to develop new tools and methods, which can't happen without study and experimentation. A lot of the real work happens not in the gym but in books, scientific literature, and conversation with other trainers and coaches.
• Efficacy is ultimately determined by your athletes' performance, and performance must be measured. Competition, testing, and recordkeeping are what tell you the difference between merely looking or feeling good and actually being good at your job.
• Your commitment shows in the first meeting: you are all theirs, the object of your focus and the focus of your conversation. Clients come back not for your physical capacity but because they believe in your capacity to develop theirs. Notably, world-class athletes rarely make world-class trainers.
• Reject skill-less, low-skill programming, it delivers inferior results and turns trainers into cheerleaders. The professional understands the mechanics, cues, and techniques of complex movements and can teach them, bringing a skill set that scares off most trainers.
• Keeping up with your athletes' progress demands you keep advancing your own understanding: 'If a trainer's clients are not testing the limits of his knowledge, he is not doing a good enough job with them.' The master trainer is proud to have a student exceed his abilities but seeks to delay it by staying ahead of the athlete's needs, never by holding the athlete back.
• Because you want the training to transcend the physical, you're obligated to understand clients' jobs, hobbies, families, and goals. Motivating clients to transcend fitness requires being involved in their lives, being both interested in them and interesting to them, which means showing up at parties, weddings, and family gatherings as a genuine friend.
• The payoff of that relationship: clients do all your marketing. The professional doesn't advertise, promote, or market, he trains very, very well, and the more clients he gets, the more they bring. (The Scaling Professional Training portion that follows shows how this creed played out as the practice grew.)
• The standard, unyielding commitment to client and efficacy, guided everything and was the primary reason for CrossFit's success. A one-on-one practice running roughly 5-10 a.m. Monday-Saturday produced a low-six-figure income, while keeping afternoons free for family, recreation, and study.
• There's a real ceiling on one-on-one work. Training at that level of attention and commitment is draining, and about five appointments a day was the limit before an unacceptable drop in energy, focus, and professional standards. When demand exceeded that, the answer was group classes.
• Group classes have a powerful upside: the social dynamic motivates an athletic output rarely matched one-on-one (the source of the lines 'men will die for points' and CrossFit as 'the sport of fitness'), and they dramatically increase training revenue.
• Group classes have two drawbacks. First, space, but it's not linear: training 10 people doesn't take 10 times the space, and space for one athlete can serve three or four well. Second, the lower trainer-to-trainee ratio can dilute professional training standards, which can be compensated for only by a rarely found skill set.
• Running group classes without compromising laser focus requires giving each member the impression he's getting all the attention he'd get one-on-one, which takes tremendous skill. The only proven path to that skill is gradually migrating from one-on-one to group sessions. Trainers who jump straight into group classes without growing into them usually aren't meeting professional standards, and tend to have trouble filling their classes.
• The concrete migration model: start by doubling up clients into one-on-two appointments. Tell existing clients the good news, their rate goes down and they'll meet a new friend, and ask for a trial period where there's resistance. Structurally, a client paying $75 might now pay $50; adding a third brought it to $40. With each added athlete the per-athlete rate falls and the trainer's hourly revenue rises, which works perfectly unless attention is perceived to drop.
• All demands on the trainer skyrocket in a group: attention, enthusiasm, voice projection, and engagement all have to escalate. It's an acquired skill, an art. The goal is to give so much attention and 'in your face' presence that each participant is grateful he didn't get more. The level of scrutiny and criticism ratchets up alongside the rate of praise and input. A new trainer can't walk into this and do well, and a trainer who participates in the workout while trying to lead it produces substandard training.
• Within two years the practice morphed from all one-on-one to all group classes without working more hours (keeping a couple of choice one-on-one clients), charging $15 per class and averaging 10-15 athletes per session. This substantially raised income and boosted the stability of the practice, seasonal dips from summer and Christmas vacations largely disappeared, unlike a one-on-one practice where a few simultaneous client vacations hit income hard.
• CrossFit.com launched at the same time, motivated by the same commitment to client and efficacy, not to increase revenue but to favorably impact more people. The group classes, website, CrossFit Journal, seminars, and affiliate program were all introduced to bring more quality training to more people, and each addition increased CrossFit's value for everyone. The original one-on-one clients were the first to benefit from all of it, every expansion served the whole community.
• The business philosophy: pursuit of excellence, not money. Accept three premises, markets are largely unknowable, excellence is obvious to everyone, and free markets reward excellence, and it follows that the most effective business plan is to achieve excellence and let the market bring the money to you. The Santa Cruz expansion was decided not on uncertain financial projections but on a simpler question: 'Will it improve the quality of the programming and the training experience?' The answer was yes; the numbers tripled within six months and the extra space enabled programming refinements.
• As seminars, journal, website, and affiliate program grew, the group classes were handed off to a new generation of CrossFit trainers who now cover most of the overhead, freeing time and resources for new projects that support and develop the CrossFit community.

Words to know (plain English)

Efficacy

The trainer's competency measured by results, ultimately by the athlete's measured performance; the professional's single standard of value.

The professional's creed

The stated standard that clients are the top priority and competency equals efficacy, an unyielding commitment to client and results.

Recordkeeping / testing

Measuring athletes' performance over time so the trainer can tell real improvement from merely looking or feeling good.

Skill-less / low-skill programming

Easy-to-coach programming that avoids complex movement; it delivers inferior results and turns trainers into cheerleaders.

Master trainer

A trainer who stays ahead of the athlete's needs, eager to be exceeded but advancing his own knowledge to keep delivering value.

Trainer-to-trainee ratio

The number of athletes per trainer; a lower ratio in group classes can dilute professional standards unless the trainer has the skill to compensate.

One-on-two appointment

The first step in migrating to groups, pairing two clients in a session, which lowers each client's cost and raises the trainer's hourly revenue.

Group class

Coaching multiple athletes at once; powerful socially and for revenue, but it demands escalated attention, voice projection, and engagement.

Pursuit of excellence (business plan)

The principle that achieving obvious excellence in a free market draws money to you, so excellence, not revenue, drives every decision.

'The sport of fitness'

The idea, born from the competitive energy of group classes, that fitness itself can be made competitive and measurable.

Key ideas to understand

• Passing the Level 1 course isn't the finish line: you must agree to the CrossFit Level 1 Trainer Certificate License Agreement. This section summarizes it in plain English, but you're still responsible for everything in the full Agreement.
• The single most important distinction: the CrossFit METHODOLOGY versus the CrossFit BRAND. The methodology (the training itself, free on CrossFit.com for over a decade) is free to use and follow. The brand name is NOT free.
• What a CF-L1 CANNOT do: you cannot use the CrossFit brand name to advertise, market, promote, or solicit business or services in any way. Doing so breaches the Agreement and can make you liable for trademark infringement under Federal Law.
• How to earn the right to advertise using the CrossFit name: become a licensed CrossFit affiliate. That means submitting an application, being accepted, and paying the annual affiliation fee. Affiliation is what unlocks the trademark for advertising.
• What a CF-L1 CAN do with the name: use only the terms 'CrossFit Level 1 Trainer' or 'CF-L1 Trainer' on a resume, business card, or trainer bio on a website. That's it. You may NOT call yourself a 'Certified' CrossFit Trainer, that title is reserved for Level 3 and above.
• What a CF-L1 can do without the brand: train yourself, teach friends for free, and introduce the methodology to others. You just can't use the CrossFit brand name or CrossFit's copyrighted material (like the Training Guide or Participant Handbook) to market your services.
• You're also bound to uphold the highest standards of ethics and behavior; actions that reflect unfavorably on CrossFit, LLC are a breach of the Agreement.
• CrossFit's legal department aggressively pursues unlicensed use of the brand name and copyrighted material worldwide. Questions about proper use go to legalintake@crossfit.com; suspected misuse is reported at crossfit.com/iptheft.
• FAQ, teaching classes: you can teach CrossFit classes and advertise yourself as a CF-L1 ONLY if you're at a licensed affiliate. At a non-affiliate (like a commercial gym), you cannot use the CrossFit brand name to advertise your classes at all.
• FAQ, advertising 'similar' training: as a CF-L1 you may use the methodology and train people on your own, but only affiliation lets you use the CrossFit trademark to describe your programming or advertise your services as 'CrossFit.'
• FAQ, word of mouth: even telling clients you're 'doing CrossFit' verbally is NOT permitted without affiliating first. Word-of-mouth marketing of CrossFit training counts as use of the trademark.
• FAQ, training off-site: a CF-L1 who trains clients at homes or commercial gyms still cannot use the trademark without affiliating, but can always state the credential on a business card, resume, or bio.
• FAQ, 'Certified': you cannot call yourself a 'Certified' CrossFit Trainer; that's reserved for Level 3 and above. The correct descriptions are 'CrossFit Level 1 Trainer' or 'CF-L1 Trainer.'
• FAQ, what the credential gets you: you're listed in the CrossFit Trainer Directory (a public database to find licensed trainers), and the CF-L1 is the prerequisite for more advanced courses, including the Level 2 Certificate Course.
• The credential ladder, bottom to top: CF-L1 (Level 1 Trainer), CF-L2 (Level 2 Trainer), CF-L3 (Certified Level 3 Trainer), CF-L4 (Certified Level 4 Coach). Note 'Training' covers L1 and L2; 'Certification' covers L3 and L4.
• Ladder requirements. CF-L1: no prerequisites; obtain by 100% participation in the Level 1 course and passing the test; maintain by reattending and passing the test every 5 years. CF-L2: prerequisite is a current CF-L1; obtain by 100% participation in the Level 2 course and meeting current certificate requisites; maintain by reattending and meeting requisites every 5 years.
• CF-L3: prerequisites are a current CF-L2 plus CPR/AED; obtain by passing the ANSI-accredited CrossFit methodologyination; maintain every 3 years with 50 CEUs + 300 CrossFit training hours and current CPR/AED. CF-L4: prerequisite is a current CF-L3; obtain by passing a performance evaluation; maintain every 3 years with 50 CEUs + 300 CrossFit training hours and current CPR/AED.

Words to know (plain English)

CrossFit methodology

The training approach and programming itself, free to use and follow on CrossFit.com; what you learned in the course.

CrossFit brand / trademark

The protected CrossFit name and marks. Not free, you can't use them to advertise without a license (affiliation).

License Agreement

The CrossFit Level 1 Trainer Certificate License Agreement you must accept after passing; it spells out what's permitted and prohibited.

Affiliate / affiliation

A licensed CrossFit gym. Affiliation (apply, get accepted, pay the annual fee) is what grants the right to advertise and market using the CrossFit name.

CF-L1 / CrossFit Level 1 Trainer

Your credential after passing the Level 1 course; the only brand wording you may use, and only on a resume, card, or bio.

'Certified' CrossFit Trainer

A title reserved for Level 3 and above; a CF-L1 may NOT use the word 'Certified' to describe themselves.

Trademark infringement

Unauthorized use of a protected brand name; using 'CrossFit' to advertise without affiliating can make a CF-L1 liable under Federal Law.

CrossFit Trainer Directory

A public online database listing licensed CrossFit trainers; being listed is one perk of holding the CF-L1.

CrossFit methodologyination

The ANSI-accredited Certified CrossFit Trainer credential required to obtain the CF-L3 credential.

CEU (Continuing Education Unit)

Credit earned through approved learning; CF-L3 and CF-L4 require 50 CEUs (plus 300 training hours and CPR/AED) every 3 years to maintain.

Key ideas to understand

• Effective coaching is six capacities: teaching, seeing, correcting, group management, presence and attitude, and demonstration. This section drills the first three — teach, see, correct — on the nine foundational movements.
• Know the nine in order: Air Squat, Front Squat, Overhead Squat, Shoulder Press, Push Press, Push Jerk, Deadlift, Sumo Deadlift High Pull, Medicine-Ball Clean. They're three families (squats, presses, pulls) that build on each other.
• Teaching = knowing the points of performance (set-up, execution, finish). Seeing = spotting those points and any deviation in real time. Correcting = improving the client's mechanics to better hit the points of performance.
• Each movement has at least Points of Performance and Common Faults and Corrections. Some also have a Teaching Progression that breaks a complex lift into simple steps. The progressions exist to develop the primary points of performance.
• The movements stack: the air squat is the cornerstone and feeds the front and overhead squat; the shoulder press feeds the push press, which feeds the push jerk; the deadlift feeds the sumo deadlift high pull, which (with the front squat) feeds the medicine-ball clean.
• AIR SQUAT — the cornerstone. Set-up: shoulder-width stance. Execution: hips descend back and down, lumbar curve maintained, knees in line with toes, hips descend lower than knees, heels down. Finish: full hip and knee extension.
• AIR SQUAT faults: losing the neutral spine (lumbar flexion), weight shifting to the toes, improper line of action (hips don't travel back, knees shoot forward), not hitting depth, and knees caving in (not tracking the toes). Plus two named bad squats: the 'immature squat' (all points held but the athlete cantilevers forward onto the quads) and the 'multiple-fault squat' (can't hold lumbar curve, heels, knee tracking, and depth all at once).
• AIR SQUAT corrections worth knowing by name: lift the chest / raise the arms on the descent (for lumbar flexion); exaggerate weight on heels by lifting the toes, tactile cue hips back and down (for toe shift); block the knees' forward travel by hand (for line of action); cue 'Lower!' and use a depth target (for depth); 'Push your knees out' / 'spread the ground apart' and an outside-knee target (for knees caving). And Squat Therapy — face a wall or racked bar with a depth target, heels to a box, chest close, squat slowly with control on the heels.
• FRONT SQUAT — the air squat plus a loaded barbell in the front-rack position. New set-up points: loose fingertip grip, hands just outside shoulders, elbows high (upper arm parallel to the ground). All air-squat faults still apply, plus two new ones: improper rack (bar not in contact with the torso) and elbows dropping during the squat. Corrections: open/fingertip grip with the bar on the fingertips, 'Elbows high!', manually adjust the rack; for dropping elbows, have them move elbows away from your hands, cue 'Elbows up!' and lift the chest.
• OVERHEAD SQUAT — the air squat with load locked out overhead. New set-up points: shoulders push up into the bar, arms extended, wide (pass-through) grip, armpits face forward; in execution the bar moves over the middle of the foot. New faults: inactive overhead position (flexed elbows / inactive shoulders) and the bar drifting forward of the frontal plane. Corrections: press the bar up, tactile cue elbows straight + shoulders up + armpits forward; press up and pull the bar back over midfoot or slightly behind the frontal plane.
• SHOULDER PRESS — foundational to all overhead lifts; keys are a neutral spine, a straight bar path, and a correct overhead position. Set-up: hip-width stance, full grip, elbows slightly in front of the bar, hands just outside shoulders, bar rests on torso. Finish: full arm extension, spine neutral, legs extended, heels down, shoulders push up into the bar, bar over the middle of the foot.
• SHOULDER PRESS faults: overextending the spine (ribs sticking out), bar finishing forward of the frontal plane, bent elbows / inactive shoulders, and the bar arcing around the face instead of straight up. Corrections: tighten the abs by pulling the rib cage down (then recheck overhead), wider grip until flexibility improves; press up and pull back, tactile push the bar back; 'Press up!' with a tactile lockout; pull the head back out of the bar's way, check elbows aren't too low at set-up, block the forward bar path with a piece of PVC.
• PUSH PRESS — the shoulder press plus a vertical dip and rapid hip extension to add velocity. Same set-up, bar path, spine and overhead positions as the shoulder press. Execution: torso stays vertical as hips and knees flex in the dip; hips and legs extend, THEN the arms press; heels stay down until hips and knees extend. Teaching progression (4 steps): (1) dip and hold, (2) dip-drive slow, (3) dip-drive fast, (4) full push press.
• PUSH PRESS faults: forward inclination of the chest in the dip, 'muted hips' (hips push forward during the dip instead of flexing), and pressing early (the press starts before the hip extends). Corrections: hold the dip and adjust them upright / shorter dip / 'Knees forward' / stand in front of them, and Dip Therapy (stand against a target, hips and shoulder blades touching, dip-drive keeping contact); tactile cue to create hip flexion in the dip and 'Push the hips back slightly'; for pressing early, go back to two dip-drives before the press and hold a hand at standing height for them to drive up and hit before pressing.
• PUSH JERK — the push press plus a press UNDER the bar. Same set-up, bar path, spine/overhead, dip and drive. After hip extension, the athlete presses against the bar and receives it in a partial overhead squat, then stands to finish. Teaching progression (4 steps): (1) jump and land, hands at sides, stick the landing before standing; (2) jump and land, hands at shoulders, stick the landing; (3) jump and extend the arms after the hip opens, stick the landing with arms overhead; (4) full push jerk with PVC.
• PUSH JERK faults (all shoulder-press and push-press faults still apply): lack of full hip extension, poor/inactive overhead position especially when receiving the bar, and lowering the bar before standing all the way up. Corrections: 'Jump higher' and a hand at standing height to hit during the drive, plus going back to steps 1–3 and squeezing glutes/quads before pressing under; press up on the bar in the receiving position before standing; keep the bar overhead until hips and knees are fully extended, with a tactile hand to hit before lowering.
• DEADLIFT — foundational to all pulling lifts; the spine stays neutral the whole time and the bar stays close to the frontal plane. Set-up: hip-to-shoulder-width stance, full grip, hands just outside hips, shoulders slightly in front of or over the bar, arms straight with the bar on the shins, eyes on the horizon. Execution: lumbar curve maintained, hips and shoulders rise at the same rate until the bar passes the knee, THEN the hips open, bar over the middle of the foot, heels down. Finish: full hip and knee extension.
• DEADLIFT faults: loss of lumbar curve (spinal flexion) — abort and drop the load; weight shifting to the toes; shoulders behind the bar at set-up; hips too high at set-up; hips not moving back to start the descent; bar losing contact with the legs; and hips rising before the chest (the stiff-legged deadlift) or shoulders rising without the hips so the bar travels around the knees. Corrections include: cue 'lift the chest' at a lighter load and don't relent; pull the hips back and settle on the heels; raise or lower the hips to set shoulders over/slightly in front of the bar; initiate the return by pushing hips back and delaying the knee bend until the bar is below the knees; 'Pull the bar in to your legs the whole time' with a tactile cue to engage the upper back; cue the chest and hips to rise in unison; 'Push the knees back as the chest rises.'
• SUMO DEADLIFT HIGH PULL (SDLHP) — the deadlift with a wider stance and a narrower grip, plus added velocity and range of motion. A classic core-to-extremity movement: hips and legs accelerate the bar before the arms finish the pull. Set-up: slightly wider than shoulder-width stance, hands inside the legs with a full grip. Execution: lumbar curve maintained, hips and shoulders rise together until the bar passes the knee, then hips extend rapidly, shoulders shrug THEN the arms pull, elbows move high and outside, bar over midfoot. Finish: full hip and knee extension with the bar pulled under the chin. Teaching progression (4 steps): (1) sumo deadlift, (2) sumo deadlift-shrug slow, (3) sumo deadlift-shrug fast, (4) full SDLHP.
• SDLHP faults (all deadlift faults still apply): pulling early (shrug or arm bend before the hips fully extend), pulling with the elbows low and inside, incorrect descent (hips flex before the arms extend), and shoulders rolling forward in the set-up or pull. Corrections: go back to the deadlift-shrug at a controllable speed, then two deadlift-shrugs for every one full rep, with a tactile cue to hit your hands with the shoulders before the arms pull; 'Elbows high!' with a tactile target for where elbows finish; slow the descent and extend the arms first; fix the shoulder position at set-up or top of pull, and widen the grip and/or reduce range of motion to keep shoulders in place.
• MEDICINE-BALL CLEAN — builds on the deadlift and SDLHP; the new piece is the pull-under, which brings the ball to the front-rack (support) position. Set-up: shoulder-width stance, ball between the feet, palms on the ball, shoulders over the ball, eyes on the horizon. Execution: lumbar curve maintained, hips extend rapidly, shoulders then shrug, heels down until hips and knees extend, then the arms pull under to the bottom of a squat with the ball close to the body. Finish: full hip and knee extension with the ball at the rack. Teaching progression (5 steps): (1) deadlift, (2) deadlift-shrug fast, (3) front squat, (4) pull-under, (5) full medicine-ball clean.
• MEDICINE-BALL CLEAN faults: lack of full hip extension; curling the ball; collapsing in the receiving position; receiving too high; tossing/flicking the ball without pulling under; and not standing up before lowering the weight. Corrections: two deadlift-shrugs per clean with a tactile head cue before pulling under; stand in front (or use a wall) to block the curl and 'Elbows high and outside!' (keep the laces facing out); lift the chest in the front squat and rehearse the pull-under with sound front-squat mechanics; hold the ball at the peak of the shrug to rehearse pulling under without raising it (and two pull-unders per clean); have them hold the ball with palms/fists only to feel the hand rotation; and keep the ball at the chest until the shoulder hits a target so they stand fully before lowering.

Words to know (plain English)

Points of performance

The specific positions and actions that define correct execution of a movement (set-up, execution, finish) — what a trainer teaches and watches for.

Teaching

Knowing the points of performance for a movement, including set-up and finish positions, well enough to convey them to a client.

Seeing

Assessing the points of performance — and any deviation from them — in real time as a client moves.

Correcting

Improving a client's mechanics so they better adhere to the points of performance, using verbal, visual, or tactile cues.

Teaching progression

A breakdown of a complex movement into simple steps, each developing a primary point of performance, so the full movement can be built up safely.

Lumbar curve

The natural inward curve of the lower spine that must be maintained (a neutral spine) under load to keep the back safe in squats, deadlifts, and pulls.

Front-rack position

Supporting a load on the front of the torso (bar resting on the torso, elbows high; for the med-ball clean, the ball at the chest) — the receiving/support position for front squats and cleans.

Frontal plane

The vertical plane running side-to-side through the body; loads in overhead and pulling movements should stay over the midfoot, in or just behind this plane.

Dip-drive

The vertical dip of the torso followed by rapid hip and leg extension that adds velocity to the push press and push jerk — hips fire before the arms.

Press under / pull-under

Actively driving the body down beneath the bar (push jerk) or ball (clean) to receive it in a partial squat or front rack, rather than pressing or muscling the load all the way up.

Muted hips

A push-press fault where the hips push forward during the dip instead of flexing, which kills the drive out of the bottom.

Immature squat

A squat in which all points of performance are technically held, but the athlete cantilevers forward excessively onto the quads to keep balance.

Multiple-fault squat

A squat in which the athlete can't simultaneously maintain the lumbar curve, keep weight on the heels, track the knees over the feet, and reach depth.

Stiff-legged deadlift (as a fault)

A deadlift fault where the hips rise before the chest, breaking the rule that hips and shoulders rise at the same rate until the bar passes the knee.

Squat Therapy

A corrective drill: the athlete faces a wall or racked bar with a depth target, heels to a box, chest close, and squats slowly with control and weight on the heels.

Tactile cue

A correction delivered by touch — guiding the bar, hips, elbows, or shoulders with a hand to show the athlete the correct position or path.

Core to extremity

The principle that force is generated from the center of the body outward to the limbs — seen clearly in the sumo deadlift high pull, where hips and legs drive the bar before the arms finish.

Key ideas to understand

• These four movements — the pull-up, thruster, muscle-up, and snatch — are taught on top of the nine foundational movements for two reasons: to clean up the participants' own mechanics, AND to give you a teaching method for more complicated movements. They're built on top of the basics you already know.
• Each movement is laid out the same three ways as the nine foundational movements: (1) Points of Performance (the set-up/execution/finish checkpoints), (2) Common Faults and Corrections, and (3) Teaching Progression. Read each movement through that same lens.
• The neuroendocrine reminder up top still drives exercise selection: regardless of sport or goals, the criterion is neuroendocrine effect, and these high-value moves are the shortest path to results.
• PULL-UP — the kipping pull-up is CrossFit's default. Why kip? The hips assist the upper-body pull, so the athlete does more work in less time (higher power). But CrossFit wants a strict pull-up FIRST to build baseline shoulder stability and strength before kipping.
• Pull-up points of performance: hands just outside shoulder width, hang with arms fully extended, pull until the chin clears the bar, push away from the bar to start the descent, initiate the kip swing from the shoulders, and as the feet swing forward push the bar straight down with the arms — chest up, eyes forward — then return to full extension to begin the next rep.
• Pull-up faults and fixes: (1) starting the swing with the legs → go back in the progression to the kip swing and drive it from the shoulders; (2) not pushing away after clearing the bar (dropping straight down instead of riding the arc) → pause at the top focusing on pushing away, do two kip swings between reps, or set a target behind to push toward; (3) losing midline stabilization by overextending the spine or exaggerating the swing → tighten the kip by keeping legs together and knees straight, or put a towel between the feet to hold a tight body.
• Pull-up teaching progression (5 steps): 1) kip swings, 2) two kip swings and a kip, 3) two kip swings and a pull-up, 4) two kip swings + a pull-up + two kip swings, 5) multiple pull-ups without extra swings. The whole progression is built around owning the kip swing before stringing reps.
• THRUSTER — it's a front squat plus a push press in one continuous movement. The athlete must move core-to-extremity: extend the hip FIRST, then press. Two key differences from a plain front squat: the thruster uses a FULL grip on the bar (not the loose fingertip grip) and a LOWER elbow position.
• Thruster points of performance: elbows in front of the bar, bar on the front rack, hands just outside the shoulders, full grip, shoulder-width stance; hips descend back and down below the knees with the lumbar curve maintained, knees tracking the toes, elbows off the knees; hips and knees extend rapidly and THEN the arms press; heels stay down until the hips and knees extend; bar travels over the middle of the foot; finish at full hip, knee, and arm extension.
• Thruster faults and fixes: most front-squat and push-press faults carry over, plus (1) pressing the bar before extending the hips → tactile cue, have them hit your hand before pressing; (2) descending into the squat before the bar is racked → take them back in the progression and pause in the rack position before squatting.
• Thruster teaching progression (4 steps): 1) front squat, 2) push press (wide stance), 3) thruster pausing at the reset, 4) multiple thrusters with no pausing at any point. You build the two halves separately, then fuse them and remove the pause.
• MUSCLE-UP — it's a pull-up and a dip combined into one movement: the athlete pulls from a hang to a position of support above the rings. The two keys that link the pull-up to the dip are the FALSE GRIP and the positioning of the rings during the transition. Because the rings are dynamic and unstable, CrossFit wants a STRICT muscle-up before any kipping muscle-up.
• Muscle-up points of performance: rings about shoulder-width apart, false grip on the rings, hang with arms extended; pull the rings to the sternum as the torso leans back; move the chest over the rings while hands and elbows stay close to the body; finish at full arm extension in the support position.
• Muscle-up faults and fixes: (1) losing the false grip → make sure the false grip is set before the rep, and allow bent arms while strength to hold it with straight elbows develops; (2) staying too vertical in the pull so the rings can't get into transition position → lean back so the rings pull to the chest; (3) letting the elbows flare during the pull or transition → keep the elbows close to the ribcage throughout; (4) not pulling the rings low enough before transitioning → cue lean-back-and-pull-to-the-sternum, or go back to the kneeling muscle-up drill at a challenging ring height.
• Muscle-up teaching progression (5 steps): 1) ring support, 2) ring dip, 3) false grip, 4) kneeling muscle-ups (raise the rings or move the feet further forward to make it harder), 5) the muscle-up. Notice it teaches the support/dip and the false grip before ever attempting the full pull-to-support.
• SNATCH — 'the world's fastest lift' — moves the barbell from the ground to overhead in one movement, received at the bottom of an overhead squat. Its complexity is exactly why it's so valuable for CrossFit athletes.
• Snatch points of performance: hip-width stance; hands wide enough that the bar rests in the crease of the hips when hips and knees are extended; hook grip on the bar; shoulders slightly in front of the bar; eyes on the horizon; lumbar curve maintained; hips and shoulders rise at the SAME rate; then the hips extend rapidly; heels down until hips and knees extend; shoulders shrug, followed by a pull-under with the arms; the bar is received at the bottom of an overhead squat; finish at full hip, knee, and arm extension with the bar over the middle of the foot.
• Snatch faults and fixes (most deadlift, sumo deadlift high pull, and medicine-ball clean faults also apply): (1) lack of hip extension → cue 'Jump higher!', hold your hand at standing head height and have them hit it on the drive, or do two snatch deadlift-shrugs per snatch; (2) not moving the elbows high and outside / swinging the bar around the body → tactile cue with the PVC, cue 'Elbows high and outside!', cue brushing the shirt with the bar; (3) shoulders rise without the hips → cue 'Push the knees back as your chest rises,' check the set-up isn't too low, tactile cue at hips and shoulders to lift together; (4) hips rise without the shoulders → cue 'Keep the chest lifted as you straighten your legs,' check the set-up isn't too high, tactile cue to lift in unison.
• Snatch teaching progression (6 steps): 1) deadlift to mid-thigh, 2) deadlift-shrug, 3) muscle snatch, 4) overhead squat, 5) hang snatch, 6) snatch. The progression builds the pull, the shrug, the turnover, and the overhead receiving position in pieces before putting the full lift together from the floor.
• Big-picture pattern across all four: each one is a combination of simpler movements you already coach (pull-up = strict pull + kip; thruster = front squat + push press; muscle-up = pull-up + dip; snatch = deadlift + shrug + overhead squat). The progressions all teach the pieces first, then assemble. Faults are corrected primarily by stepping BACK in the progression, not by adding cues alone.

Words to know (plain English)

Points of performance

The specific position and execution checkpoints (set-up, execution, finish) that define correct movement and tell you exactly what to coach and watch for.

Teaching progression

The ordered series of smaller drills used to build a movement piece by piece. Also the place you send an athlete BACK to when a fault shows up.

Kipping pull-up

CrossFit's default pull-up, where a coordinated swing of the hips assists the upper-body pull so the athlete does more work in less time (higher power).

Strict pull-up

A pull-up with no kip — pure upper-body strength. CrossFit wants this first to build baseline shoulder stability and strength before kipping.

Kip swing

The shoulder-initiated swing that powers the kipping pull-up. The foundation of the entire pull-up progression.

Midline stabilization

Keeping the spine braced and neutral instead of overextending or exaggerating the swing — a key fault point on the pull-up.

Thruster

A front squat and a push press fused into one continuous movement, using a full grip and lower elbows, driven core-to-extremity (extend the hip, then press).

Core-to-extremity

Moving from the center of the body outward — extend the powerful hip first, then the arms press. Breaking this sequence is the signature thruster fault.

Front rack

The bar resting across the front of the shoulders with elbows up — the racked position the thruster squats from and presses out of.

Muscle-up

A pull-up and a dip combined: the athlete pulls from a hang to full support above the rings. The false grip and ring position make it work.

False grip

A grip set so the wrist rides on top of the ring, keeping the hand high enough to transition from the pull to the dip. Losing it is a core muscle-up fault.

Kneeling muscle-up

A scaled muscle-up drill done from the knees; raise the rings or move the feet forward to make it harder. The go-to rehearsal for the full muscle-up.

Snatch

'The world's fastest lift' — the barbell goes from the ground to overhead in one movement, received at the bottom of an overhead squat.

Hook grip

Gripping the bar by trapping the thumb under the first fingers — the secure grip used for the snatch.

Pull-under

After the shrug, actively pulling the body down under the bar to receive it overhead — a key part of the snatch turnover.

Muscle snatch

A snatch received without dropping under the bar (no squat) — a progression step that teaches the turnover and overhead path.