20130345031 | EXERCISE APPARATUS - An exercise apparatus is provided and includes a seat, a curved track, a linker, a backrest, and a replacing force means. The curved track is connected to the seat. A first end of the linker is slidably mounted on the curved track. An end of the backrest is pivotally connected to the seat, and a second end of the linker opposite the first end is pivotally connected to the backrest. The replacing force means is used for providing a replacing force to replace the backrest. | 12-26-2013 |