Shoulder external rotation stretch in supine (Shoulder internal rotators stretch, with stick, arm 90/90 to side, supine)

Lie on your back holding onto a broomstick or rod.
Place your symptomatic arm out to the side, about 90 degrees away from you.
Bend your elbow to a right angle.
The stick should lie vertically in the direction of your body.
Using your good arm, push the stick upwards, turning the forearm of the symptomatic arm upwards.
Do not allow your upper arm to move upwards.
You should feel a stretch at the front of your shoulder.
Hold this position.