Abstract: A swimming exercising and training tether device includes an elongated tether line connected at one end preferably through a coil spring or other elastic, shock-absorbing member, to an anchor adjacent a wall of a swimming pool and at the opposite end detachably to the back panel of a harness worn by a swimmer. The attachment to the back panel is in the area intermediate the shoulders of the swimmer. Intermediate the ends of the tether line it extends freely through a loop or ring secured to the back panel of the harness in the area intermediate the hips of the swimmer. The loop or ring functions to raise the hips of the swimmer to the level promoting most efficient swimming posture in the water.