Place the top of your hand into the small of your back, your arm at a 90 degree angle.
Hold your elbow with the other arm, and slowly pull the arm forward until you feel your shoulder engaged in the stretch. Pause at the apex of the stretch and return to the starting position.
Return to starting position, and repeat with your other arm.
Stand with you feet shoulder width apart. Place one arm across the front of your chest at shoulder height, press the forearm of your other arm above the elbow, hooking the stretching arm with your hand.
Press the arm until it is straight and rotate your upper torso to engage the stretch even deeper.