Ball Push Ups on Knees
Begin this exercise kneeling down in front of the ball placing your hands on either side about shoulder width apart.
With your back straight and head up, lower your body towards the ball bending only at your elbows.
Once your chest touches the ball, pause and come back up to the extended position.
This exercise takes good concentration and stability - you can always practice on the floor without a ball placing your hands on the floor.