Get your heart rate up while you sculpt your arms, chest and upper back.
Stand with your knees slightly bent, your feet shoulder width apart and a dumbbell in each hand held vertically at chest level.
Punch with one arm, rotating your shoulder and the dumbbell as you extend your arm forward. Immediately pull your arm back and ï¾punchï¾ with your other arm.
Continue to alternate rapidly from side to side, keeping your arms parallel to the floor as you punch.