A wrist band is provided for each of the user's wrists, such wrist bands being removably attachable to the wrists by wrapping therearound and securing in place by a fastening device such as a Velcro fastener. Each band has a looped thong extended therefrom in the direction of the user's fingers, the user's middle finger fitting through the thong such that palmar flexion of the hand is restricted. The wrist bands are joined together by a strap which is attached to the bands in the region of the user's thumbs. The user's wrists are thus joined together so that in preparing for and in making a tennis stroke, the arms move together so as to facilitate the training of a player to turn the shoulders and twist the body. A single one of the wrist bands can also be used on the hand used for making the toss in serving to train the player to toss the ball straight up or on the racquet holding hand to train the player to avoid palmar flexion while driving the ball.
