Isometric shoulder flexion works the muscle at the front of the shoulder (anterior deltoid), which holds the arm up, and the muscle that draws the shoulder blade forward around the ribs (serratus anterior), which does most of the push. The arm does not move. You face a wall with one arm straight out in front at about shoulder height, palm flat on the wall, and push into it, then hold. Physios often use holds like this early in shoulder rehab, while moving the arm against a weight is still too much.

How to do the isometric shoulder flexion

Stand facing a wall with your feet about shoulder width apart. Stand tall without arching your lower back.
Lift the sore arm straight out in front of you to about shoulder height and put the palm flat on the wall. Your shoulder, elbow and hand should make one straight line.
Step in or back until the arm is straight with the palm just resting on the wall and your weight still over your feet.
Push the palm into the wall without bending the elbow. Nothing should move, and your body should not tip toward the wall.
Hold the push for a few seconds, breathing normally, then ease off and lower the arm to your side.

What you should feel

Effort at the front of the shoulder and along the side of the chest below the armpit. The press should feel firm but never painful.

Common mistakes

Leaning your body weight into the wall, which turns the hold into a push-up.
Hitching the shoulder up toward your ear while you push.
Letting the elbow bend as the effort builds.
Holding your breath once you push harder.

How often

Often 5 to 10 holds of 5 to 10 seconds, once or twice a day, starting with a gentle push and building up over the days. Your physio will adjust this.

Stop and check with your physio if

The shoulder feels like it is slipping out, or suddenly feels loose or gives way.
You feel a sharp pain or a catch in the shoulder as you push.
Pain, tingling or numbness runs down the arm into the hand.
Pins and needles in your arm or hand that do not go away after you stop, or part of your arm or hand goes numb. Get medical advice the same day. If one side of your face or body suddenly goes numb or weak, or your speech becomes slurred or muddled, call emergency services, even if it goes away.
A sudden pop or tearing feeling in the shoulder that brings sharp pain, new weakness or trouble lifting the arm. Stop and contact your surgical team the same day, or get medical advice the same day if you have not had surgery.
The shoulder feels as if it has slipped out of place, looks a different shape or suddenly locks so you cannot move the arm, or your hand turns cold, pale or blue. Go to an emergency department straight away, without driving yourself, and do not try to put the shoulder back in yourself.

From the clinic

Start with a press you could keep up easily, and add effort only if the shoulder is no more sore afterward. If you have high blood pressure, breathe steadily through every hold and never hold your breath. You can do the same kind of hold in other directions with isometric shoulder extension and isometric shoulder abduction. Once the holds are easy, many programs move on to the serratus punch, and later to wall push-ups, where the arm moves and starts to take some body weight.

After shoulder surgery, including a rotator cuff repair, or after a shoulder fracture or dislocation, follow your surgeon's or physio's plan, and do only the movements and range they have cleared. Many plans allow only passive movement at first, where the arm is moved for you and its muscles stay relaxed. Stop if the shoulder feels like it is slipping out. Pushing through a straight arm held in front of you presses the ball of the joint toward the back of the socket. If your shoulder has ever slipped out toward the back, ask your physio before you start this one.

Written and checked by the PocketPhysio editorial team. Last updated 2026-09-28.

This page is general education, not a diagnosis or a personal treatment plan. If you have pain, an injury or a health condition, see a physiotherapist or doctor before starting new exercises.

Isometric shoulder flexion