Shoulder straps are also called upper limb straps, including sternoclavicular joints and acromioclavicular joints. According to your question, it includes the sternum, clavicle and scapula. When the shoulder strap moves, because the scapula and clavicle are closely connected, it is regarded as a whole, and moves around the axis of sternoclavicular joint, showing the movement of the scapula, that is, lifting, abduction (abduction) and retraction (adduction), and rotating up and down (the angle under the scapula is far from the spine, and vice versa).