Stand up with your right arm overhead and elbow bent behind you so the tips of your fingers are touching the back of your shoulder.
Place your left hand on your raised elbow. Take a deep breath in, and as you exhale begin to gently pull your right elbow behind your head, reaching your right fingers down your back toward your spine. Take another deep breath in and as you exhale, lean to the left as far as feels comfortable, being careful not to twist. Hold this stretch for about 30 seconds and then come back to center and gently release your arm.
Repeat the stretch with the left arm.