Tightness in the mid-back or thoracic spine area can have a significant impact on you and your golf swing. Specifically, a tight T-spine can cause lower back and/or shoulder and neck pain, and can take away from your ability to swing an efficienct golf club. Here is a great, simple matrix you can do to help loosen up the thoracic spine and help your golf game.
Many golfers lack the ability to disassociate their upper and lower bodies. This can rob the golfer of power and distance. Here is a great drill to help develop lower body mobility and independence.
Stability in the shoulders is essential for golf and the golf swing. Here are two good exercises to strengthen the serratus anterior, one of the main shoulder stabilizers.