
standing shoulder external rotation with elbows bent at 90 degrees, rotating arms outward and back.
Stand, bend the elbows to 90 degrees such thst elbows are 2-3 inches away from the trunk with thumb pointing away from each other. Rotate the arm away from each other without moving the elbow, rotate back to starting position. Repeat
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.