isometric horizontal adduction of shoulder with elbow bent, pushing arm toward midline against manual resistance
Stand, elevate the arm to 90 degrees forward, bend the elbow to 90 degrees such that forearm in front of chest. Place another hand on the inner aspect of arm, move the arm towards the body against the resistance of other hand. Hold and release the push. Repeat
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.
