by Men's Health

Build big power with this whole-body, two-dumbbell plan.

You'll use the same pair of dumbbells for each exercise in this routine. Choose a weight that just barely allows you to do 12 biceps curls. If it's too light, you won't build as much muscle, says Houston-based trainer Carter Hays, C.S.C.S.

Too heavy and your form will break down first, your ligaments later. Proceed in circuit fashion, moving from one exercise to the next without rest. At the end of the circuit, rest for 60 seconds. Repeat for a total of four rounds.

*Mouse over the image for caption.

71: Percentage of Americans who did not stick to their fitness goals in 2006

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