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The 21-Day Shred: Full-Body Workout to Build Muscle and Burn Fat

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Circuits are a gym's equivalent of a no-brainer, requiring only that the trainee move from machine to machine for a prescribed number of repetitions, over and over again. Here is a better circuit, one that involves free weights, to build more muscle, burn more calories, and keep you challenged for the long term.

Digital director Mike Simone demonstrates.