Abstract: A golf swing aid constrains the swing of an associated headless golf club to provide a golf student with proper golf club swing notion. Flanged backswing and downswing rails are intermediated by a continuous curved rail and supported by a rail support. The curved shape of the rails is derived from the proper "inside out" professional-type golf swing and may be determined on a theoretical or experimental basis. A headless golf club has a rolling clevis that engages the flanged rails to roll thereupon. The golf student so engaging the headless golf club is then constrained in the golf swing to follow the shape of the rails. This requires the student to use the back muscles rather than the wrists, arms and shoulders to develop the proper swing action. The flanged rails have open ends so that when the point of impact is reached at the completion of the downswing, the student may follow through on the shot with the headless golf club leaving the downswing rail.