
lying supine, assist internal rotation of shoulder with opposite hand while elbow supported on towel roll at ninety degrees
Lie on the back with feet on the floor and knees bend and place a towel roll under the elbow and bend to 90 degrees, hold the forearm just above the wrist with other hand. Holding the wrist with other hand, rotate the arm inward such that hand moving towards the body, rotate back to starting position. Repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.