Chest-to-Wall Shoulder Stretch for Overhead Mobility and Upper-Back Stiffness Restricted overhead motion is often blamed on the shoulders alone. But reaching the arms overhead requires several areas to work together, including the: Shoulder joints Shoulder blades Chest Latissimus dorsi Rib cage Thoracic spine Neck Core When one area is limited, the body often finds movement somewhere else. You may notice: The ribs flaring forward The lower back arching The shoulders shrugging