Shoulder external rotation in abduction with stick in supine (Shoulder external rotation 90 to 180° AAROM, with stick, arm out to side, supine)

Lie on your back holding a stick in both hands.
Bring your affected elbow out to your side at shoulder height with your hand pointing towards the ceiling.
Your elbow should be at 90 degrees holding the stick with your forearm vertical.
Keeping your upper arm rested on the floor, rotate the stick overhead as though trying to reach the back of your hand to the floor ahead.
Control the movement as you bring your forearm back to the vertical position and repeat.