Wall sit: how to do it, how low to go, and what it trains

A wall sit is a squat held still. You lean your back against a wall, slide down until you're sitting on an invisible chair, and stay there. Nothing moves, so the work is holding the position: the front of the thighs, the quadriceps, hold your knees bent against your body weight, with the glutes working beside them. It needs a wall and a clock, nothing else.

It's a different tool from a moving squat. A bodyweight squat gets harder with more reps, slower reps and pauses; a wall sit gets harder with more time, more depth, one leg or a weight on your lap. This page covers the position, how low to go, what the studies measured, what they haven't tested, the versions, the faults, and how long to hold.

How to do a wall sit

1. Stand with your back against a wall, feet about hip-width apart.
2. Walk your feet out about two feet from the wall.
3. Slide down until your thighs are about level with the floor. Your knees should sit over your ankles; if they're in front of your toes, walk your feet further out.
4. Settle in: back and head on the wall, weight through your whole foot, arms at your sides or crossed over your chest, not pushing on your thighs.
5. Hold for your set time, breathing normally the whole way. Count out loud if it helps; it stops you holding your breath.
6. Stand up by pushing through your feet and sliding back up the wall, or put your hands on your thighs to help.

How low to go

Depth is the main dial. In 29 young men, each holding a two-minute wall sit in separate sessions at five knee angles, from 135 degrees down to 95 degrees (180 is a straight leg), rated effort rose significantly with each 10-degree step deeper.¹ Thighs level with the floor is close to the deepest of those angles, and it's the usual target.

Deeper may also matter for what the hold builds. A 2019 systematic review of 26 isometric training studies and theses, not of wall sits in particular, found that holds at longer muscle lengths produced more muscle growth than the same amount of holding at shorter lengths, and carried over more to movement.² In a wall sit, a deeper knee bend puts the front of the thigh at a longer length. That's a reading of the review, not a wall-sit result, but it points the same way as the effort study: start where you can hold good position, and work toward thighs level.

Muscles worked

• The front of the thighs. The quadriceps hold the knee bent; they're the muscles you feel first.
• The glutes too. In 24 healthy adults aged 18 to 21, 14 women and 10 men, holding five positions for 90 seconds each, the wall sit and a standing single-knee raise fatigued the gluteus medius, the gluteus maximus and the rectus femoris, one of the quadriceps, most reliably of the five.³
• Not the most front-thigh activity there is. In 22 active young men holding the bottom of each squat for three seconds, a wall squat with a ball behind the lower back produced less activity in two of the quadriceps, the rectus femoris and the vastus lateralis, than a Spanish squat, a version with a strap behind the knees.⁴
• Harder in the legs than it looks. In 15 recreationally active adults doing six body-weight squat versions for 90 seconds each, the wall sit was rated harder in the legs than 90 seconds of deep squats.⁵

Activity and effort are measured during a set; they aren't growth over weeks.

What it builds, and what hasn't been tested

In most of the studies a PubMed search for this page turned up, the wall sit is a fitness test rather than the training. None of them trained people with wall sits alone and measured thigh strength or muscle size, so there's no trial to quote on what weeks of wall sits build. The closest evidence is the review above: isometric training in general built muscle and strength in the studies it covered, more so at longer muscle lengths.²

So use the wall sit for what it clearly is: a hard hold for the thighs that needs no equipment, fits anywhere, and is easy to make harder. If your goal is bigger, stronger legs, it sits beside squats, lunges and leg extensions, not in place of them.

Harder versions

• Longer. Add 10 seconds to each hold before anything else.
• Lower. Work from a shallow bend down to thighs level, as above.
• Weighted. Rest a plate or a dumbbell on your thighs, close to your hips.
• One leg. From a two-leg wall sit, straighten one leg out in front and hold; switch sides. Start shallow.
• With a squeeze. Hold a ball or a pillow between your knees. The inner thighs join in; the adduction machine page covers those muscles.

The common faults, and a fix for each

• Feet too close to the wall. If your knees end up in front of your toes, walk your feet out until they're over your ankles.
• Hands on the thighs. Pushing on your legs takes load off them. Arms by your sides.
• Holding your breath. Breathe normally, or count out loud.
• Sliding up as you tire. Set a depth you can keep for the whole hold; a shorter hold at the right depth beats a long one that creeps up.
• Knees falling in. Keep them in line with your feet.
• Holding through something that hurts. Burning thighs are the point; a sharp or lasting hurt in the knee isn't. Stop, and see a doctor or a physical therapist.

How long to hold, and how often

• Start with three holds of 20 to 30 seconds at a depth you can keep, with about a minute between them.
• Build to 45 to 60 seconds, then make it lower, weighted or one-legged rather than ever longer.
• End each hold with a few seconds in you, the way a set ends with reps in reserve. (How to judge reps left.)
• Where it goes: at the end of a leg session, or in a home workout after the squats and lunges.
• Track it like any lift: the time, the depth and any weight. (Progressive overload covers the options.)

If you'd rather not plan it alone

A wall sit is simple; fitting it into a week of squats and lunges, and knowing when it's doing more for you than another set of them, is the part a page can't do. Coaching is the version where your workouts are built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one. Coaching to build muscle explains how that works, and here's how to apply. Otherwise: at the end of your next leg session, do three 30-second wall sits with your thighs level, and write down the time.