Most people sit more than they should. The result is that the shoulders give up on their normal function and allow the large muscles along the back and hips to take over. You recognize this as a slouch. In mindfulness martial art practice, it means the root of the arms is not functioning. Without restoring that root, your hands are useless. This exercise works on strengthening the muscles of the upper back and reengaging the shoulder. Arm Circles help to strengthen and improve the shoulder range of motion.