Abstract: An apparatus for developing a consistent and working golf swing in the classic form, by constraining the movement of the wearer's trail arm in relation to the wearer's torso from the set-up, through striking of the ball, while allowing for unrestricted movement for the swing follow through. The apparatus comprises a resilient arm band formed in an arm loop that is partially self adjusting, being worn by a golfer on the trailing arm just above the elbow. The arm band connects to an adjustable strap assembly which comprises an inelastic strap which adjustably loops through a manually adjustable strap buckle. The adjustable strap assembly connects to a belt line anchor through an “O”-ring connector. The belt line anchor is attached to the wearer's waist or belt at a point on the waist or belt, above the hip of the wearer on the wearer's pants or belt, opposite the trailing arm.