6.2 Recognising Sound Mechanics: What 'Good' Actually Looks Like
Key Takeaways
- A coach who can only identify faults has half the skill; recognising sound mechanics is what allows you to reinforce, to know when to stop correcting, and to decide when an athlete is ready to progress.
- Sound mechanics means safe, effective, and efficient movement: it protects the athlete, produces the intended output, and wastes as little energy as possible.
- Individual anatomy produces legitimate variation — limb lengths, hip structure, and mobility change what a correct squat looks like — and variation is not automatically a fault.
- Sound mechanics under fatigue is the real standard; anyone can look good on rep one.
- Naming what is good, specifically and out loud, is a coaching action with as much value as correcting what is bad.
Why 'Identify Sound Mechanics' Is Its Own Task
The content outline lists "identify sound mechanics" as a separate task from "identify faults in movement", and the separation is deliberate. A coach who has trained their eye only to detect errors develops three predictable problems:
- They over-correct. Every athlete gets a cue on every set, including the athletes who were moving well, which erodes trust and clutters the class.
- They cannot decide when to progress an athlete. Progression requires recognising consistent soundness, not just the absence of a fault you happened to notice.
- They never reinforce. Athletes learn as much from being told precisely what was right as from being told what was wrong, and reinforcement is what makes a correct pattern stick.
The Three Criteria of Sound Mechanics
Safe. The movement does not place tissue in a position or under a load it cannot tolerate. Spinal position is maintained, joints are loaded within their structure, and the failure mode is controllable.
Effective. The movement produces its intended result — the load moves through the required range, the target musculature does the work, and the intended stimulus is achieved.
Efficient. The movement wastes as little energy as possible. Efficiency is the criterion that matters most for repeated work: a snatch that is safe and effective but takes a long horizontal bar path will fail long before a tight one when the workout is thirty reps.
These are ranked. A movement that is efficient but unsafe is not sound. A movement that is safe but ineffective (a quarter-depth squat) is not sound either. All three must be present.
Legitimate Variation Is Not a Fault
The most common error in developing a coaching eye is treating a single visual template as the standard for every body. Anatomy varies, and so does correct movement.
| Source of variation | What it changes | What is still non-negotiable |
|---|---|---|
| Femur-to-torso ratio | Long femurs produce a more forward torso angle in the squat; this is structural, not a fault | Lumbar curve, heels down, knees tracking, depth |
| Hip socket orientation | Stance width and toe angle vary considerably between athletes | Knees tracking whatever the toe angle is |
| Shoulder and thoracic mobility | Front-rack position and grip width differ | Elbows high enough to keep the torso upright; bar supported on the shoulders |
| Arm length | Deadlift start position and hip height differ | Bar over mid-foot, spine neutral, shoulders slightly ahead of the bar |
| Ankle mobility | Depth achieved and torso angle | Heels down; if heels rise, this becomes a fault to address |
The test to apply: does the variation compromise safety, effectiveness, or efficiency? If it does not, it is that athlete's version of correct, and cueing them toward a generic template will make their movement worse.
Sound Under Fatigue
The real standard is not what rep one looks like. It is what rep fifteen of round four looks like. Fatigue is where mechanics reveal themselves, and it is where the coaching decision actually gets made.
What to look for as a workout progresses:
- Does the athlete's position hold, or does it drift progressively?
- Does the athlete self-manage — break the set before position degrades, rather than after?
- When they resume after a break, does the position come back?
An athlete whose mechanics hold across a whole workout, who breaks sets at the right moment, and who resets deliberately is showing consistency, which is the gate to more intensity. An athlete whose mechanics are flawless while fresh and gone by round two has a consistency problem, not a mechanics problem, and the answer is different: lower load, shorter sets, longer exposure.
Naming What Is Good
Reinforcement has to be specific to work. "Nice job" transmits approval; "your lumbar curve held on every single rep of that last set — that's the thing that's changed" transmits information the athlete can reproduce.
A usable habit for a class: for every athlete you correct, name one thing that athlete did well, specifically. It costs four seconds, it keeps correction from feeling like criticism, and it builds a shared vocabulary — because an athlete who has been told precisely what was right now knows what to aim at rather than only what to avoid.
This also solves the practical problem of the athlete who is moving well and therefore gets ignored. In every class there are two or three athletes who never get coached because they never do anything wrong. They are the most likely to leave, and the fix is to give them the same attention in the form of refinement and reinforcement rather than correction.
Two athletes squat with visibly different torso angles at the bottom. One has notably long femurs relative to their torso. Both maintain a neutral spine, heels down, and knees tracking the toes. How should the CCFT respond?
An athlete's clean is technically flawless for the first three reps of every set and degrades badly by rep six. What does this pattern indicate and what is the appropriate response?
Which criterion of sound mechanics is most likely to be the limiting factor in a 30-rep snatch workout, assuming the athlete's position is safe and the reps are completed?