Golf swing training device having constant resistive and rewind forces throughout the swings. An anchor positions a constant force unit, supplies a tether to a special contoured handle and is used indoor or out, preferably at a driving range or golf course. The CFU is preferably hung from a door top by a bracket or anchored to a free-standing pole. Kiosks may be located at driving ranges and golf courses for automated, coin or credit-card operation, or attendant operation, and may be linked to local or remote Internet-enabled computer control and monitoring centers. The use of constant force trains the body to learn perfect planar swing muscle memory by pulling the user into a fully-extended back swing position and to be lead side dominant in the down swing. A "perfect" club swing plane is developed with the force acting at or near the interlock by use of the special handles.