Lie on your back with your affected arm by your side, facing in to your hip.
Position the top of your shoulder against a solid object.
The purpose of the object is to keep your shoulder down.
Ensure you keep your neck long throughout this exercise.
Bend your wrist in, and then start moving your arm away from your side, making sure you do not allow your shoulder to hunch.
If your arm reaches the same height as your shoulder, stop the movement and begin to rotate your forearm inwards.
When you feel a stretch begin, ease off until it goes, and repeat the movement.
