an exercise barbell comprises a pair of rings connected by a pair of curved bars . the rings rotatably support handle members . extensions of the bar on the exterior of the two rings support crescent - shaped weights which conform to the outer diameter of the ring and to one another . the weights are relatively flat so the entire apparatus lies in a single plane . a straight bar connecting the opposed sides of the two rings supports a sliding weight which may be moved to one side of the bar or the other to allow asymmetrical exercises .