Standing with your feet shoulder width apart, cross your arms over and place your hands on your biceps. Make sure you keep your back and shoulders upright, then slowly rotate your shoulders to the left and hold. Repeat this stretch by rotating to the right.
Don't ever under estimate the importance of stretching and the benefits it holds.
Always remember that while stretching may be recommended to aid recovery out of injury, you should always be very careful when stretching through rehabilitation. Your soft tissues are likely to be more vulnerable to re-injury if you stretch too much or too hard during this time. Always check with your Health Care Professional who is guiding you through your recovery to make sure it is appropriate to start stretching, and please - ALWAYS FOLLOW THE RULES FOR SAFE STRETCHING (The first posting on this stretching blog).
Image taken from "Upper Body Stretches" wall chart by B. Walker.