A regular pushup works your core. A reverse pushup will work it so hard your abs will want to form a labor union.

How does it work? You lower your body down into a pushup, but instead of pressing up, you bend your knees and press your body backward, almost scraping the floor with your nose. Then you dig your toes into the floor to explosively blast back into a pushup position. (Hard to picture? Check out the video.)

"When your legs fire you out, it puts extra acceleration into the movement, and your core has to work extremely hard to decelerate your body," says B.J. Gaddour, C.S.C.S., creator of Speed Shred, the new 8-DVD workout series from Men’s Health. (It's designed to get you leaner and fitter, faster then ever before.)

The result: All the shoulder- and arm-building benefits of a pushup, plus a killer core workout. Watch the video to see how to do the reverse pushup with perfect form.

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