Which joints are involved in a shoulder shrug?

A shoulder shrug primarily involves the sternoclavicular joint and the acromioclavicular joint. The movement is facilitated by the trapezius and levator scapulae muscles, which elevate the scapulae. Additionally, the glenohumeral joint may play a role in stabilizing the shoulder during the shrug. Overall, these joints work together to allow for the upward movement of the shoulders.