Abstract: Multifunction fitness device for elastic resistance systems achieved by a mechanical resistance holding system having one or two pieces and, as a rotating mechanism, includes an upper and a lower rotating disk rotatably connected to a vertical shaft, or, as a disk mechanism, includes two angular sections connected by a frame, which are all equipped with holes and partial holes, which are connected with lengthwise elastic resistance materials in various thicknesses for accommodating coupling elements and coupling sockets, and with which the mechanical resistance holding system is equipped, and a mechanical drive-positioning system, including an angular gear unit, a switching and adjusting mechanism, and an unlocking and locking unit, and the mechanical carrier system, including a mechanical part for accommodating the coupling elements with the elastic resistance materials and a guide part, which slides on guide pipes and over a lifting block system with a mechanical rope pulley adjustment system.