A golf swing aid apparatus includes a first plate and a second plate. Each of the first and second plates has a top side, a first end edge, a second end edge, a first lateral edge and a second lateral edge. The top sides of each of the first and second plates are concavely arcuate. A hinging assembly hingedly couples the first end edge of the first plate to the second end edge of the second plate to substantially align the top sides of the first and second plates when the first and second plates are in an unbent orientation with respect to each other. The hinging assembly allows the first and second plates to bend with respect to each other after a predetermined amount of force is exerted on the hinging assembly. A strap assembly releasably secures the first and second plates to a golfer's arm.