Wall Walk Up and Crunch Down

Loop a light, circular band around your wrists. Stand close to a wall with your elbows on the wall straight out from your shoulders - with palms facing each other. Keep your elbows in, while you create tension in the band with your shoulders. While keeping one arm stable, move the other arm slightly in, up, and then out holding tension on the wall, as you move the arm out. Repeat on the other side going up and down.