How to do 4 types of dumbbell punches

Get the shoulders of a boxer without ever entering the ring. This exercise builds your shoulders with a series of classic boxing moves, with weights in each hand to up the ante. Learn how to do dumbbell punches (the four types are: side-to-side, cross up, cross down, and hooks). Presented by Real Jock Gay Fitness Health & Life.
Starting Position
Stand upright with your feet wider than your shoulders and your knees slightly bent. Sit down into your hips and engage your abdominals. Hold dumbbells in each hand just above shoulder level. Your elbows should be bent close to your body, and the dumbbells held with palms facing each other.