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Knee & Ankle

Wall Squat

Also called: Wall sit

The wall squat is the strength exercise for the knee that does not want to move. Nothing travels, the depth is entirely under your control, and isometric holds are often the most comfortable loading a painful knee will accept, sometimes easing the pain for a while afterwards. It is a standard part of knee osteoarthritis programmes for exactly that reason, and it is a useful fallback on the days when sit to stands and step ups feel like too much. Depth, not time, is the dial you turn.

Reviewed by Dr. Shyyada Banu, BPT, MPT · MIAP License No. 69386

Wall Squat

Demonstration photo coming soon

Part of these sets

This exercise rarely works alone. It appears in the following routines, where it is sequenced alongside the others that support it.

What it works

Primary muscles

  • Quadriceps

Also involved

  • Gluteus maximus
  • Calves and hamstrings, holding the shin steady

Equipment: A clear stretch of smooth wall. A gym ball behind the back makes the slide easier.

How to do it

  1. 1

    Stand with your back flat against a wall and walk your feet out about half a metre, hip width apart.

  2. 2

    Slide down the wall until the knees are bent to a comfortable angle. A quarter to a half squat is plenty; a right angle is a target, not a requirement.

  3. 3

    Check that the knees sit above the ankles rather than out beyond the toes, and that the whole of each foot stays on the floor.

  4. 4

    Hold, breathing steadily, with the weight even through both feet and the thighs doing the work.

  5. 5

    Push through the heels to slide back up, and rest for roughly as long as the hold before repeating.

How much to do

3 to 5 holds of 20 to 45 seconds

Most days for an irritable knee, 2 to 3 times a week as strength work

Discomfort up to about four out of ten during the hold is acceptable if it settles within 24 hours. Sharper than that means come up higher on the wall rather than push on.

Stop and get assessed if

Stop and get assessed if the hold produces sharp pain at the front of the knee rather than a burn in the thigh, or if the knee swells afterwards. Get medical advice before using long isometric holds if your blood pressure is high or poorly controlled, because holds like this push it up further.

Common mistakes

Going too deep too soon
Depth is what makes this hard, and it is also what presses the kneecap into the thigh bone most firmly. Come up until the hold is a strong burn in the thigh rather than a pinch at the front of the knee.
Feet too close to the wall
It drives the knees out over the toes and loads the kneecap instead of the thigh muscle. Walk the feet further out until the shins are roughly vertical at the bottom.
Holding the breath
Isometric holds raise blood pressure on their own, and breath holding raises it further, which matters if yours is already high. Breathe steadily, and count out loud if you catch yourself holding.
Chasing ever longer holds
A four minute wall sit is a party trick, not a knee programme, and the last three minutes are mostly discomfort tolerance. Once 45 seconds is comfortable, add depth or load instead of minutes.
Knees drifting inwards
Inward collapse concentrates load across the kneecap, which is often the sore structure. Keep each knee in line with the second toe and press the outside edges of the feet gently into the floor.

Making it harder

  • Slide a little deeper, towards a right angle at the knee, as comfort allows.
  • Rest a weight on your lap or hold one against your chest.
  • Shift most of your weight onto one leg for the last few seconds of each hold, building towards a single leg wall squat.
  • Move to sliding wall squats: down over three seconds and up over three, which turns the isometric into a full strength exercise.

Making it easier

  • Reduce the depth to a shallow bend and shorten the holds to ten seconds, building time before depth.
  • Place a gym ball between your back and the wall so the slide is smoother and the depth is easy to adjust mid hold.

Helps with

More exercises