To play golf at your full potential you must be able to possess the ability to rotate almost every joint in your body to its functional capacity. If there are restrictions in the shoulders, torso, pelvis or hips, there will be compensations somewhere else in the musculoskeletal system, which results in faults in the golf swing and possible injury to joints and muscles. This stretch is to help move your upper back and arms more freely.
Stand in a should width stance.
Interlace fingers and stretch arms out straight to feel stretch in back and arms.
Drop your chin to your chest and puff up your back and scoop in your stomach.
Hold position for 8 to 10 counts.