According to one aspect of the present disclosure, a stationary exercise apparatus which not only can a user exercise alternately with one leg lifting and the other leg pressing but the exercising paths thereof are capable of being adjusted so that the user is capable of exercising with different postures and motions and having more abundant exercise types. For the sake of safety, stability, and convenience, the supporting portions for the user to step on have specific orientation angles and don't rotate arbitrarily to different positions at every point of the exercising path.