Abstract: An instructional device to assist a golfer in developing a golf swing. A base member has one or more transversely extending projections mounted on its top surface, each of which has a rounded top edge to provide a pivot surface for a top board member. The top board is formed with a plurality of transversely extending grooves or a rounded projection on its bottom surface, operatively engageable with the base projections for pivotally or rockingly mounting the top board member on the base. A golfer assumes a usual golf stance on the top board. The weight shift of the golfer upon addressing a ball and during the backswing and downswing, causes the top board to pivot on the projections in a predetermined manner when done correctly to assist the golfer in perfecting the correct golf swing.