Rolling Pin

The Rolling Pin exercise works your deep abs, obliques, butt and hamstrings.

Resting your shins on the ball in plank position, lift your left leg off the ball a few inches as you bend your right leg, rolling the ball slightly forward. Straighten your right leg and repeat. To make this easier, keep both shins on the ball as you roll it forward. Do 10 reps, switch sides and repeat.