In the golf swing, you need to move certain parts of your body, while other parts stabilize. This is what helps you create clubhead speed. If your shoulders are tight, then you can’t swing your arms independently from your torso and you won’t be able to create clubhead speed.
Stand in a shoulder width stance.
Raise both arms out in front of you so that they are parallel to the ground.
Stabilize your torso and hips as you swing one arm behind you as far as you can go without moving your torso.
Return the arm to the start position and repeat on opposite arm. 5.
Do 8 to 10 repetitions on both arms.
This exercise will train the mobility and strength of the shoulders while the spine stays stable just like you need in the golf swing.