Movement: Grasp a light resistance band in front of you. Pull it apart to the sides and slowly bring it overhead and behind your back. If you have difficulty bringing your shoulders behind you, assume a wider grip and pull the band farther apart to extend your range of motion.
Emphasis: The purpose of the exercise is not to build strength or try to use the heaviest band, but rather to support shoulder mobility and health.
Instructions and effects for the Band Dislocates exercise 
Movement in Sagittal and Frontal Planes