Abstract: A restraint, particularly suited for use in exercising swimmers, characterized by a base adapted to be affixed to a wall of a water-filled pool, a socket of a truncated helmet-like configuration adapted to receive a swimmer's head, coupling means including a universal joint connecting the socket to the base supporting the socket for universal oscillation, and a pair of handles suspended to be grasped by the swimmer. Where so desired, pressure sensing means are interposed between the base and the socket for measuring pressures at which the swimmer's head is applied to the socket and, where further desired, guides of substantially elongated configurations are suspended from the base in substantially spaced parallelism beneath the surface plane of the water and employed in controlling stroking motion of the swimmer.