This exercise loosens your rotator cuff muscles and helps to keep you from shoulder strain. To effective stretch you should hold this stretch for 30 seconds, and repeat three times. Here are other tips to perform this exercise:
Your elbow should be placed just below the level of your shoulder.
Your right shoulder should be slightly behind your left shoulder, not directly over it.
A.1. Lie on the floor on your left side with your left upper arm on the floor and your elbow bent 90 degrees.
2. Adjust your torso so that your right shoulder is slightly behind your left, not directly over it.
3. Your fingers on your left hand should point toward the ceiling.
B. 1. Gently push your left hand toward the floor until you feel a comfortable stretch in the back of your left shoulder.
2. Hold for the prescribed amount of time, then roll over and repeat the stretch for your right shoulder.