Take a ball and throw it overhand. That action is the same action your trail arm does in a golf swing. It is a universal action in sports. Whether you are throwing a ball or shooting a basketball, the wrist and hand react the same. Throw sidearm then underhanded. You start to feel how your hand and arm work on different planes. Put that same action into your golf swing. When you throw a ball, there is no tension in your shoulder socket. That should be the same in a golf swing.