To do this exercise you will need a mat. Start by lying on your side with your knees bent. Be sure that your hips, ribs, shoulders, and head are in line with each other. Place your top elbow and your top ribcage. Inhale into the back of the ribs and then exhale as you rotate the top arm outward so that your fingertips point to the ceiling. Inhale as you return to center and then exhale and repeat. Continue repeating this exercise 8-10 times.
Things to think about
When you are side lying be sure that your shoulders are stacked and that your neck is long. It is okay to support your head with your bottom arm.
Also be sure that your elbow is stay in the same place in space as the upper arm rotates in the shoulder socket. Be sure that your collarbones are wide and you shoulder blades are strong.