How to use | When golf scholars swing, their left arm is often bent during the upswing process, resulting in failure to hit the ball or unsatisfactory shots. The correct upswing posture is that the left arm should be kept straight and not bent. Use this A curved arm alerter. As long as the left arm of the golfer is bent during the upswing, the alerter will make a prompt sound. The player will know the error and correct it in time, so that the left arm maintains a stable and correct posture. ;nbsp; |