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What muscles does a shoulder shrug work? The main muscles that shoulder shrugs target are the trapezius muscles. These muscles are located on either side of your neck. They control the movement of your shoulder blades as well as your upper back and neck. When these muscles are strengthened through exercise, you will have an easier time maintaining proper posture. A strong trapezius pulls your shoulders back and helps stabilize your neck and upper back. Everyday movements such as lifting, reachin