Movement: Stand tall with shoulder blades together, grasping a towel at one end in your off hand. Gently move the working arm behind the body, and grasp the opposite end of the towel. Gently pull upwards until you feel a stretch in the rear of the shoulder. Hold and repeat on the opposite side.
Repetitions: Hold for the full prescribed time on one side, then switch sides and repeat. This counts as one set.
Instructions and effects for the Shoulder Stretch with Towel exercise 
Movement in Sagittal and Transverse Planes