HOW: Begin in a half kneeling position with the leg away from the wall stabilized against the wall with a ball. With both hands directly in front of you, rotate one arm open attempting to reach the wall behind you. Exhale as you rotate, inhale as you return to neutral and repeat.
FEEL: You will feel the mid back and shoulder open with his exercise.
COMPENSATION: Avoid rotating from your lower back. The motion should primarily be occurring at your mid back.