A compounded fitness trainer, including a base, on which a loading device is pivoted; a pair of first driving bars pivoted on the base for swinging; a pair of second driving bars pivoted on the base for swinging; a pair of first linkages respectively pivoted on the second driving bars and opposite sides of the loading device; and a pair of second linkages respectively pivoted on the first driving bars and the first linkages wherein the first driving bars are moved by the second driving bars when the second driving bars are moved, and the second driving bars are moved by the first driving bars when the first driving bars are moved whereby moving the first driving bars and/or the second driving bars may train different muscles.