How to do it: Stand holding a pair of dumbbells with your feet shoulder-width apart. Let the dumbbells hang at arm's length next to your sides, your palms facing each other [A]. Without changing the bend in your elbows, raise your arms at an angle to your body (so that they form a ''Y''), until they're parallel to the floor [B]. At the top of the movement, shrug your shoulders upward [C]. Pause, then reverse the movement to return to the start, and repeat.