Once at shoulder width, rotate your wrists forward so that the palms of your hands are facing away from you. The dumbbells should be just to the sides of your chest, with your upper arm and forearm creating a 90 degree angle. Be sure to maintain full control of the dumbbells at all times. This will be your starting position.
Then, as you breathe out, use your chest to push the dumbbells up. Lock your arms at the top of the lift and squeeze your chest, hold for a second and then begin coming down slowly. Tip: Ideally, lowering the weight should take about twice as long as raising it.