HOW: Begin by lying on a bench with a dumbbell in each hand. Hold the dumbbells straight above your shoulders with a slight bend in your elbow and your knuckles facing each other. Let your arms fall out to the side as far as you feel comfortable with. The goal is to get your arms close to being parallel with the ground. Return to the starting position and repeat.
FEEL: You should feel your chest muscles working.
COMPENSATION: Keep your back flat on the bench. Move each arm evenly.