An elliptical trainer includes a base, a pair of foot-oriented elliptical mechanisms, and a pair of hand-oriented elliptical mechanisms. The base is anteriorly provided with a frame having a first axle and a second axle. The first and second axles are parallel and spaced apart by a distance. The foot-oriented elliptical mechanisms flank the frame and include a revolving assembly pivotally disposed at the first axle and adapted to enable the foot-oriented elliptical mechanisms to revolve relative to the first axle. The hand-oriented elliptical mechanisms flank the frame and include a reversing assembly pivotally disposed at the second axle. The revolving assembly and the reversing assembly revolve in opposite directions. The hand-oriented and foot-oriented elliptical mechanisms enable a user's hands and feet to revolve in the same direction and follow closed paths, respectively. Hence, the user can exercise ergonomically and work different muscle groups.