Equipment: Small playground ball.

Position: Stand facing a wall with both feet approximately 3' away.  Adjust your body accordingly to roll ball up the wall with both hands.  Start with the arm below shoulder height.  Hold elbows and arms straight.  Make sure that shoulders are drawn away from ears.

Description: Place ball against wall with both hands and slowly roll it up the wall.  Hold every few inches and try to go as high as possible.
When this is too easy, just use the affected arm to roll it up as high as you can.