It is crucial to get the tension out of your arms. This Malaska Golf Mulligan Monday focuses on this.
Set up a target line and place the ball on the tee, so you know the path where your arms should be swinging. Push up to the left to start swinging your arms, and then push back to the right. Your arms swing back and forth and up, almost like a figure eight, with your body and arms accelerating and making bigger swings. Address the ball, and let your arms and hands drop.
Work on this exercise as it will help create a free flow of your arms without tension in your shoulders.