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Single Leg Chair Squat (Modified)

The modified single-leg chair squat lowers you onto a chair using mostly one leg, with the other foot lightly assisting or hovering, then stands you back up the same way. It is the safest doorway into single-leg squatting — the chair catches every rep while one leg learns to carry the load. 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

GoalSets × RepsRest
Strength4 × 4–6 per leg, slow90 s–2 min
Muscle3 × 8–12 per leg60–90 s
Endurance3 × 15–20 per leg45–60 s

Rep ranges per Helms 2014 · Schoenfeld 2016.

Level — Beginner

Beginner-safe single-leg training — the chair converts a hard balance skill into a controlled strength exercise.

Proper form — 5 cues

  1. Stand in front of a chair, one foot planted, the other extended lightly forward
  2. Sit the hips back and lower slowly onto the chair with the planted leg
  3. Keep the knee tracking over the second toe on the way down
  4. Reach the arms forward as a counterbalance
  5. Drive through the whole foot to stand, using the assisting leg as little as possible

Breathing: Inhale lowering to the chair, exhale standing back up.

The 3 mistakes Maddy corrects most

Free-falling the last few centimetres onto the seat. The drop skips the hardest part of the lowering phase — exactly the range the exercise exists to strengthen. Fix: Lower on a three-count all the way to a silent, weightless touchdown.
Knee diving inward as fatigue builds. Inward collapse under single-leg load is the pattern most linked to knee complaints in daily movement. Fix: Slow down, aim the kneecap at the second toe, and end the set when alignment cannot be held.
Rocking the torso to sling yourself off the chair. Momentum from the upper body robs the working leg of the stand-up, which is half the training value. Fix: Pause seated for one second, then stand with deliberate leg drive — add the hovering foot only as needed.

Common questions

Who is the modified single-leg chair squat for?

Anyone building toward single-leg strength from a low base: beginners, people returning after a long break, and older adults who want leg strength that transfers directly to standing up from chairs — which is literally the exercise. It is also a smart control drill for athletes whose knees wobble on one leg.

How do I progress from this to a full single-leg squat?

Shrink the assistance in stages: first use the second foot only on the stand-up, then hover it entirely, then lower the seat height cushion by cushion. When you can perform slow, quiet reps to a low seat with the foot hovering throughout, pistol-squat progressions become realistic.

What chair height should I use?

Standard dining-chair height — roughly 45 centimetres — suits most people at the start. The right height lets you complete every rep slowly, with the knee tracking straight and no crash landing. As that becomes comfortable, a lower seat extends the range and raises the challenge honestly.

Related exercises

Easier: Chair Squats  ·  Harder: Chair Single Leg Squat

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