Abstract: A bowling arm training device including a cuff or support member adapted to be detachably secured about the bowling arm of the bowler, a yieldable elastic trigger member mounted on the cuff to extend circumferentially around the inside of the cuff member and terminating in a free rear end portion cooperative with a signal device, whereby when the bowling arm swings forward in its correct delivery position close to the body of the bowler, the elastic trigger member engages the bowler's body abruptly forcing the trigger member laterally outward actuating the signal device to apprise the bowler of his correct delivery swing. If the bowling arm swings too far away from the body of the bowler, the signal device will not be actuated, thereby apprising the bowler of an incorrect delivery.