A rehabilitation mechanism includes a supporting base having a seat member, a frame member is mounted on the supporting base and includes two protrusions each having a pivot shaft, two handle members and two foot supports are pivotal attached to the pivot shaft, and a latch device includes two catch members slidably attached to the handle members and each catch member includes one end for selectively locking the handle member to the frame member and for preventing the handle member from being rotated relative to the frame member, and the catch members each include another end for selectively locking the handle member to the foot support and for allowing the handle member and the foot support to be rotated relative to the frame member altogether.