
stand facing wall, place bent elbow overhead on wall, walk forward to deepen stretch under arm, hold and release
Stand facing the wall, evelated the exercising arm overhead and bend the elbow completely and place elbow on the wall. Walk towards the wall and let the arm elevate further. Feel for the stretch under the arm. Hold and release the stretch to starting position and repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.