The Squat That Looks Wrong Under Load
A client is doing back squats with 135 lb for 3 sets of 8. On video you see his heels lift about an inch at the bottom, his knees drift inward on the ascent, and his lumbar spine round slightly in the last 15 degrees of depth. He reports no pain. Half-kneeling ankle dorsiflexion measures about 2 inches on both sides, and a bodyweight squat to a bench shows the same heel rise and inward knee drift. He says squats 'feel fine' and does not want to 'go backwards' by lowering the weight. He trains three days a week and plays recreational basketball on weekends.
1. Rank the likely contributors and explain how you distinguish a mobility limitation from a motor-control problem here.
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Ranking:
- Ankle dorsiflexion limitation is the leading candidate. The heel rise appears in an unloaded bodyweight squat and knee-to-wall is only about 2 inches, where you want roughly 3.5-4 inches (about 35-40 degrees). Range restriction shows up without load.
- Knee valgus is most likely compensatory. When the ankle cannot dorsiflex, the foot pronates and the knee drifts in. Hip abductor and external rotator control can produce the same picture, but that usually appears under load and fatigue rather than in an easy bodyweight rep.
- Lumbar rounding at end range is either hip flexion range (short hip flexors, inability to hold a posterior pelvic tilt) or losing the brace at depth.
The discriminating test: elevate his heels 1-2 inches on a wedge or plates and re-squat. If the heels stay down, depth improves, and valgus disappears, the ankle is driving the whole pattern. If valgus persists with the heels elevated, add a hip control problem to the list.
Separate position from strength: let him squat only as deep as he can hold a neutral spine. If depth is fine there and rounds only past that point, it is a positional range issue, not a bracing failure.
2. Give your four-week plan: cues, load, and exercise selection. How do you sell the load reduction?
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Load: drop back squats to roughly 95-115 lb, or swap to a goblet or front-loaded squat for the block, so he can train the pattern rather than survive it. Sell it as a four-week investment in range that he will spend later on load, not a permanent demotion. Give him a date to re-test; people accept a temporary regression when it has an endpoint.
Exercise selection:
- Box squat to the depth just above where rounding begins, with a 1-second pause on the box. Progress depth first, weight second.
- Tempo 3-1-1 at 3 x 6.
- Heel-elevated goblet squat or a wedge under the bar as a temporary measure while ankle mobility improves.
- Daily 5-minute ankle and hip drills: knee-to-wall 2 x 10 per side, calf stretch, hip flexor stretch. Five minutes daily beats 30 minutes once a week.
Cues, one at a time: 'screw your feet into the floor' for the valgus; 'brace like you are about to be poked in the stomach' for the lumbar position. Do not stack 'knees out, chest up, heels down' in the same rep; he will chase the last cue and lose the first. Basketball on weekends is a live variable here; ask how he feels the day after and whether the knee drift shows up when he lands.
3. What criteria would let you return him to 135 lb back squats?
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Criteria, not a date:
- Heels stay down through full depth in both bodyweight and loaded squats on video.
- No valgus on the last rep of a hard set; fatigue is the real test, not rep one.
- Knee-to-wall at least 3.5 inches bilaterally.
- Neutral lumbar position held at full depth without a box for 3 x 8 at RPE 8 or below.
- Two consecutive weeks of clean sets with no next-day symptoms or weekend knee soreness after basketball.
Then step load back up in roughly 10% increments, re-checking video at each step. If valgus or heel rise reappears at a given load, that load is above his current capacity and you hold there for another week or two.
The number is an output of the criteria, not a goal in itself. Tell him that explicitly so the 135 lb is not the thing he is chasing.