Abstract: A golf swing training aid with a target-line guide, a rail, a clubface guide and an upright assembly. The target-line guide provides a straight line for aiming at a target. The rail runs parallel to the target-line guide and has a bottom for placing on a golfing surface. The clubface guide is perpendicular to the target-line guide and provides a straight line for a clubface of a golf club to parallel with when the golfer sets up or when the clubface passes over, under or through the clubface guide when a golfer swings the golf club. The upright assembly is attached to the rail and is constrained along a straight line on the rail, where the straight line is parallel to the target-line guide and where the upright assembly provides the clubface guide. The target-line and clubface guide can be a rod, a string, a series of laser dots, or a laser line.