Reverse Crunch

Start out on the floor, lying on your back with your arms by your sides. In one smooth motion, bring your feet up off the floor and crunch your knees toward your chest while pressing your hands into the floor. Crunch far enough to raise your hips off the floor. Lower your hips back to the floor and uncurl your legs until they are straight, with your feet one or two inches above the floor. Repeat nonstop for one minute.