HOW: Holding a ball with both hands above your head, shift your weight to one leg to balance on just that leg. Hinge forward at the hips, and kick the other leg behind you as you try to touch the ball to the ground directly in front of you. Return to the starting position and repeat.
FEEL: You should feel your lower leg muscles working as well as a stretch in your low back muscles.
COMPENSATION: Keep a slight bend in the knee balancing so you can attempt to touch the ball to the ground. Keep your hips facing forward.