Stand facing a wall with your arm by your side, and with your elbow bent.
Place a small towel between the wall and your hand.
Slightly press your hand against the wall.
Slide the towel directly up the wall.
Keep your shoulder relaxed and level.
When you reach the highest possible position, hold for a moment.
Assist with your other hand and try to reach even further up.
Control the movement as you lower your arm back to the starting position, still slightly pressing the hand against the wall.
