The invention discloses a keep-fit exercise apparatus. The keep-fit exercise apparatus is provided with a frame which is rectangle-shaped substantially; each guide rail portion of the frame is provided with a vertical outer wall, an integrally-downwards-tilting inner wall, and an outwards-facing open narrow lot which is hidden between the inner wall and the outer wall; foot rod supporting assemblies which are movably supported by each outwards-facing open narrow slot support foot rods; each foot rod supporting assembly is provided with an elongated sliding plate which is movably supported in the narrow slot, a hook head base plate which is fixed to the sliding plate, and a foot rod supporting arm which is rotationally and slidingly fixed to the hook head base plate; one pair of tubular lifters guides the tail end of an arm rope to a rope retraction assembly installed on a supporting frame; an upper part roller which is located at the head end portion of the frame is installed in each lifter; and any one shoulder retainer rotates towards a foot end portion of the frame, so that the retraction assembly can release the rope.