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Chair Single Leg Squat

The chair single-leg squat lowers you onto a chair on one leg and stands you back up the same way — the most honest strength test either leg will face without equipment. The seat provides a depth target and a safety net, turning the notoriously hard pistol-squat pattern into something trainable today. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.

Muscles worked

Quads · quadriceps Glutes · gluteus maximus Hamstrings

Sets & reps by goal

Goal	Sets × Reps	Rest
Strength	4 × 3–6 per leg	2 min
Muscle	3 × 9–12 per leg	60–90 s
Endurance	2 × 18–27 per leg	60 s

Rep ranges per Helms 2014 · Schoenfeld 2016.

Level — Intermediate

Intermediate — the chair height is your progression dial; lower it as strength arrives.

Proper form — 5 cues

Stand a step in front of the chair, one foot planted, the other leg extended ahead.
Reach both arms forward as a counterbalance before you begin.
Push the hips back and lower over three slow seconds until you touch the seat.
Touch down light as a feather — sitting is allowed at first, crashing never is.
Drive through the whole planted foot to stand without the free leg helping.

Breathing: Inhale on the slow descent, exhale hard as you drive up to stand.

The 3 mistakes Maddy corrects most

Free-falling the last third of the descent. Gravity does the lowering and the landing jars the spine — the eccentric strength you came for goes untrained. Fix: If you cannot lower slowly the whole way, raise the seat height with a cushion and earn the lower chair later.

The working knee diving inward. The single-leg stance exposes weak hip control, and the collapsing knee funnels load through its inner structures. Fix: Track the knee over the middle toes; slow down and shorten range until it stays there.

Cheating the stand-up with a rock and a swing. The momentum heave from the seat skips the hardest, most valuable part of the rep. Fix: Pause fully seated for a beat, then stand with zero swing — lighten the depth if needed.

Common questions

Is this the same as a pistol squat?

It is the pistol squat's trainable ancestor. A full pistol descends to the floor unsupported, demanding rare ankle mobility and balance alongside the strength; the chair version caps the depth, provides a bail-out, and lets you build the same single-leg strength progressively. Lower the seat over months and the pistol stops being a mystery.

Why train one leg at a time if I can squat with both?

Because two-leg squats let a stronger side quietly carry more of the load for years without you knowing. Single-leg work finds that gap, trains balance and hip stability that bilateral lifts cannot, and loads each leg near its limit using nothing but bodyweight — which matters enormously when equipment is limited.

My knee hurts on single-leg squats — should I push through?

No. First check the two usual suspects: a knee collapsing inward and a descent that is really a fall. Fix both with a higher seat and slower reps. If pain persists with clean mechanics at an easy depth, that knee needs assessment, not more volume — pain is data, not a toughness test.

Related exercises

Easier: Single Leg Chair Squat (Modified)

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