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BRING THE SITUP BACK FROM THE DEAD
"Men spend entirely too much time doing crunches, which involve only a 30-degree range of motion--way too small to build much muscle," says Patrick Hagerman, Ed.D., C.S.C.S., a professor at the University of Tulsa. "If you want to build your abdominals, do a full situp. Your abs spend more time working dynamically under tension, so they'll grow bigger and stronger. Full situps also strengthen the hip flexors, which can get pretty weak if all you do is crunches." (To improve your crunches, add a Swiss ball. See below left.)
To do situps right, lie on your back with your feet flat on the floor, knees bent about 90 degrees, hands clasped lightly behind your head, and elbows out to the sides. Tuck in your chin, contract your abdominals, and roll all the way up until your chest nearly touches your knees. Then slowly roll back down.