wakey,

Here is a link.

http://www.thera-bandacademy.com/tba...r-the-shoulder


Look at the exercise labeled

Thera-Band Shoulder External Rotation at 0 degrees

Instead of the stretch band at mid level, anchor it at shoulder to head height. Then, with the anchor point straight ahead of your left shoulder, pull it with your right hand with your elbow swinging around behind you. As you do this, you should attempt to touch your shoulder blades together. You can't get them to touch but it is the motion to get the proper muscle use.