Can you reach both arms overhead without arching your lower back, flaring your ribs, or shrugging your shoulders toward your ears? Many people appear to have adequate overhead mobility—but only because their lower back compensates for a stiff upper back or restricted shoulders. That compensation may become more noticeable after: Sitting at a desk Driving for long periods Cycling Golfing Swimming Climbing Strength training Working with the arms in front of the body Repeated ov