Here's a good one that works both the upper and lower abs in one
Ball/Leg Exchange:
Lie on your back, legs on the floor, holding a stability ball between your feet and calves. Your arms should be straight above your head on the floor. Bring your arms and legs up at the same time, slightly crunch and exchange the ball from your legs to your hands. Go back down to legs straight just above the floor, and arms above your head. Again go back up and exchange from hands to legs. Go back to start. This is one repetition.
Decline crunches: sit on a mat with knees bent, or on a decline board with feet hooked and knees bent. Cross your arms over your chest. Keeping back straight, lean back 12-18 inches, slowly, inhaling. Hold. On the exhale, pull yourself up straight using your abs.
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