Benefits: Build strength in the abdominals and core.

Starting Position: Lie on your back with your arms extended in a T position and your legs raised.

Movement: Lower your legs, keeping them straight. Point your toes [like you would at the top of a Calf Raise] and contract your glutes while lowering your legs. Make sure you maintain contact between your lower back and the floor. As soon as your lower back separates from the floor, bend your knees and pull them in toward your stomach.

Finishing Position: Straighten your legs; begin the next repetition.