Ankle mobility: the hidden limiter on your squat

People spend months stretching their hips to fix a squat that was never a hip problem. Ankle dorsiflexion — how far your knee can travel forward over your toes with the heel down — is the quietest and most common limiter of squat depth there is.

Measure it, don't guess

Use the knee-to-wall test. Foot about 10cm from a wall, drive the knee forward keeping the heel flat. Most healthy adults should manage around 10–12cm from wall to big toe. Under 8cm and your squat is being actively restricted.

Measure both sides. Ankle restriction is very often one-sided, particularly after an old sprain — and a one-sided restriction produces a twisted squat, which loads one hip and one knee more than the other.

What restriction forces you to do

If the shin can't travel forward, your body finds the range elsewhere. The heels lift. The torso folds forward to keep the bar over mid-foot. The feet turn out and the arches collapse to fake range through the joint below. None of those are technique faults — they're compensations for a joint that ran out of room.

Fixing it

Mobilise, then load. Knee-to-wall reps at end range, then squat immediately afterwards so the nervous system uses the new range under load. Range you don't load doesn't stay.

Old ankle sprains deserve special attention — the joint capsule stiffens and the peroneals often never fully rehabilitate. Add single-leg balance and foot strength work alongside the mobility.

Measure it, change it, re-measure it. If the number didn't move, the drill didn't work — change the drill.