Supine shoulder ER(N) stretch supine (Shoulder internal rotators stretch, with stick, arm bent at side, supine; 01)

Lie on your back with your symptomatic arm on a pillow by your side.
Hold a broom stick in both hands with both elbows at a right angle.
Use your good arm to push the stick across your body towards your symptomatic arm, turning the forearm outwards.
You should feel a stretch at the front of your shoulder.
Do not allow your upper arm to move away from your body.
Hold this position.