Don't Do Crunches!

Do your regular weight-training routine—on your feet. "When you weight-train standing up, your abs have to work to stabilize the spine and keep you upright, giving you more bang for your buck," says Alwyn Cosgrove, C.S.C.S., a personal trainer in Santa Clarita, California. So, if you normally do leg presses, do squats instead. Lying leg curls? Do Romanian deadlifts. Seated biceps curls? Stand and curl. Whatever the move, make sure the stabilizing muscle tension stays on your abs, not your lower back.

Broderick Sorrell
www.brodericksorrell.com