Starting position is lying on your back and knees bent. Arms are straight and at your side. Hold dumbbell with thumb side of hand up. Begin exercise by keeping elbow straight and slowly lifting arm upward until it straight up. Reach back as far as you can, stretching your shoulder to the floor. You may use an elevated surface to allow for greater stretching of the shoulder joint. The weight should be heavy and a challenge. Slowly return to starting position. repeat specified number of repetitions.