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This kickboxing-based move targets your entire waistline of muscles—your abdominal wall, side obliques, and lower back—all while keeping your lower body engaged. It also keeps you moving quickly to help you burn more calories during your abs training, says Guillermo Gomez, 4th degree black belt and star of the "Kickboxing Cardio Power" DVD.
To do it: Start with feet in a wide stance, knees bent, arms up on guard. Keeping your lower body still, quickly lean your upper body to the right, then come back through the center and lean to the left. Repeat lean back to the right. Next, lower your upper body, from the right around to the left side, making a half circle with your torso. Return to start position. That’s one rep. (Tip: it helps to keep a steady rhythm with this move, think—or say aloud—1, 2, 3, weave to help you keep your tempo). Repeat 10 times total, alternating starting on the right and left sides.
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