A rounded upper back is often caused by spending long periods of time hunched over a desk or steering wheel. Caused by overly tight chest muscles and weak mid- and upper-back muscles, this can lead to upper-back and neck pain, and poor posture in your golf swing. Strengthening the muscles that retract or pull back your shoulder shoulder blades can help alleviate this problem.
Stand in an upright position with your arm bent and elbows by your side.
Keeping your spine straight, simply pull your your shoulders back as you squeeze your shoulder blades together.
Hold position for a moment and then release, returning to the start position.
Do 8 to 10 repetitions.