Abstract: A body of limited compressibility, and uniform thickness, defines a support for the posterior of an exerciser during sit-ups, stomach exercises, and the like. A void in the body nestably receives the coccyx area of the exerciser. The body further has an extended member for supporting the exerciser's back, and an elongate void formed in the member comfortably receives the spinal length of the exerciser. Nodules line the edges of the elongate void; these repeatedly knead spine-attached muscles as the exerciser works, supine, on the body.

Abstract: The Device is a circular body which takes the form of a disc. It has a first plurality of apertures formed therein in which to receive the little, ring, middle and index fingers of a hand. Spaced apart from the first plurality of apertures is a second plurality of apertures in which to receive the thumb of the hand. By disposing the thumb, randomly, in different apertures of the second plurality thereof, with the other fingers in the apertures of the first plurality thereof, and straining to squeeze all the fingers and thumb, forcefully, toward the center of the body, the muscle which joins the thumb to the hand gets especially exercised. The Device is non-handed; it is usable with either a left hand or a right hand.