A fitness exercise apparatus includes a main frame, a seat frame, a plurality of elastic cords, a plurality of pulling units and a pair of handles. The main frame includes a support unit having bottom and top portions. The seat frame includes a guide rail, and a seat assembly slidably disposed on the guide rail and movable toward and away from the support unit. Each elastic cord extends from the bottom to the top portion of the support unit. Each pulling unit includes a plurality of pulley sets provided on the main frame and the seat frame, and a plurality of wires each of which is looped around a corresponding pulley set and connectable with a corresponding elastic cord. Each handle is connected to a selected one of the elastic cord and the wire.