Step-Up. Stand facing a sturdy box or bench that's just below knee height. Hold five-pound or heavier dumbbells at sides. Step onto top of box with right foot, then left foot. Step back down with right foot, then left. Do eight to 10 reps. Repeat starting with left foot; that's one set. Do four to six sets.

Step-Up. Stand facing a sturdy box or bench that's just below knee height. Hold five-pound or heavier dumbbells at sides. Step onto top of box with right foot, then left foot. Step back down with right foot, then left. Do eight to 10 reps. Repeat starting with left foot; that's one set. Do four to six sets.

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