One-Leg Crunches
Strengthens your core muscles.
Lie on your back, with fingers laced behind your head, knees bent, and feet flat on the floor. Lift your right leg straight up toward the ceiling, ankle bent. Using your abs, lift your upper body toward your right toe. Pretend there's a string in your belly button that is pulling your stomach down toward the ground. Cradle your head in your hands as if it were an egg, and keep your neck relaxed. Work up to 25 times each leg.
Advanced: Straighten the lower leg, and keep it 1 inch off the ground throughout.
Source: YOU: The Owner's Manual -- An Insider's Guide to the Body That Will Make You Healthier and Younger, by Michael F. Roizen, MD, and Mehmet C. Oz, MD.









