Stretching exercises encourage lengthening of your muscles and associated tendons. Short and tight muscles can lead to pressure on nerves and pain. By its effect of lengthening muscles, stretching promotes flexibility and full range of motion about your joints.
Lift both arms above your head and bend elbows so your forearms are behind your head (but not resting on it)
Gently grasp your right elbow with your left hand
Allow your right hand to drop toward the middle of your shoulder blades
Feel the stretch on the outside of your upper right arm
Gently pull your right elbow toward your left shoulder to deepen the stretch
Repeat for opposite arm