The swing training aid includes an arm band and an adjustable cord attached to the racket and the arm band through an adjustable hook. The arm band is adjustably and detachably secured around an arm of a player. A hook strap is attached on the outside of the arm band and defines an opening for receiving the hook. The elastic cord has one end having a loop whose diameter is sufficiently large to receive a handle of the sport swing instrument. The adjustable hook has a base and a hook portion extending from the base and terminating at a hook end. The hook portion is designed to be coupled to the hook strap and the base of the adjustable hook is designed to receive the end of the elastic cord and adjustably lock the cord once the cord length has been adjusted for the player.