A golf swing training device is configured to prevent lateral movement of a golfer's hips such as during the backswing, downswing and/or follow-through portions of the golfer's swing. In addition, the golf swing training device is configured to prevent reverse rotation of the golfer's hips such as during the backswing portion. The training device may comprise a seat assembly and a horizontal arm assembly. The seat assembly is configured to be mounted to the golfer's hips and defines opposing lateral seat sides. The horizontal arm assembly is coupled to the seat assembly and is configured to be pivotable about a seat pivot axis located adjacent one of the seat sides. The horizontal arm assembly is configured to prevent reverse pivoting of the seat assembly such that reverse rotation of the golfer's hips is prevented.