Abstract: A diagnostic golf swing training device (10) for providing real time feedback to a golfer relating to the rotation of the golfer's hips and weight distribution during the golf swing is disclosed. The device (10) comprises a footplate (12) that is positioned beneath one of the feet of the golfer. A vertical support member (14) is coupled on its lower end (16) to the footplate (12). A hip plate (30) is coupled to the upper end (28) of the vertical support member (14). The hip plate (30) is adjustable such that it may be positioned adjacent to the hips of the golfer. During the golf swing, the footplate (12) provides real time feedback to the golfer by signaling excessive forward or rearward movement of the hips of the golfer if the hips of the golfer contacts the hip plate (30).