Shoulder external rotation while abducted plyometric exercise

The exercise shown is part of an exercise program for throwers. The patient begins exercise with arm abducted to 90 degrees and elbow bent to 90 degrees, while holding elastic tubing attached to a fixed object at about waist height. The patient stands facing this object. With moderate to fast speed, the patient externally rotates their shoulder to 90 degrees of external rotation, then gradually allows the band to pull the hand back to the starting position.