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It's you vs. belly fat with this intense kickboxing circuit from Guillermo Gomez, a fourth-degree black belt and star of the Kickboxing Cardio Burn DVD. Each exercise taxes multiple muscles at once to blast calories, and all the twisting action takes inches off your waist. Forget the gloves-this time it's the flab that's coming off! For the full text of this workout, click here.

How it works: Do each exercise back to back with little to no rest between. Repeat the entire circuit 1 to 3 times, depending on how much time and energy you have.