Crank your ab workout up a notch with this exercise:
Lie on your back on the floor with your hands behind your ears. Hold both feet up off of the floor with your knees over your hips. Begin by lifting both shoulders up off of the floor. Next lift your right shoulder up toward your belly button, at the same time bringing your left knee toward your belly button. Return to your starting position. Now lift your left shoulder up toward your belly button, at the same time bringing your right knee toward your belly button. Repeat 10 times.
*Consult your physician before beginning exercise.