
lying on side, rotate shoulder externally against resistance while maintaining elbow at ninety degrees flexion
Lie on one side, place a towel roll between between elbow and trunk of arm resting over the trunk, bend the elbow to 90 degrees with holding a dumbbell such that fist towards the floor. Rotate the arm towards the ceiling without moving the elbow position, roate the arm back to starting position and repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.