Starting position:
Lie on your back with your shoulder externally rotated, your elbow extended and palm facing up with the wrist extended back.
Assistant / therapist manually moves the limb from shoulder abducted and elbow flexed, to shoulder adducted and elbow extended. Try to keep the other joints still. Alternate between these two positions.
The technique should be painless.
The movements should only be taken to the point where the patient begins to feel something.