Start balancing on your right leg. If this is too hard to do, place the ball of your left foot on the ground with most of your weight on the right leg. Hold one dumbbell in your right hand, directly below your shoulder, and maintain a neutral spine. Be sure to keep your shoulders and hips square (think about your hips and shoulders pointing down toward the ground). With control, pull your elbow up toward your body as you keep it tucked by your side. Complete 10 to 20 reps.