The Ab Swing
Sit on floor with knees bent, hands planted behind you, fingertips pointing forward toward your heels. Driving heels into floor, raise your hips up to a table-top position, keeping your chin tilted toward your chest. Now, lower your hips toward the floor, and swing them back through your arms, tucking your pelvis under and keeping hips off floor. Return immediately into the bridge position. Keep your arms straight throughout the exercise. Do 15 reps without pausing.