Abstract: A portable, foldable, and manually-powered exercise apparatus including a frame having first rails and second rails. First and second rails receive a first walking surface and second walking surface, respectively. The exercise apparatus includes hinge plates connecting first and second rails and include first legs. The exercise apparatus includes second legs connecting the first rails and support and place first rails at an inclination angle. The exercise apparatus includes first rollers connecting the first rails, and second roller connecting the second rails. The first rollers and second roller receive a tread belt over the first walking surface and second walking surface. User walks/runs on the tread belt causing first rollers and second roller to rotate. The second legs fold, and the hinge plates allow folding of second rails along with the second walking surface underneath the first rails and first walking surface without the first rollers coming into contact with the second roller.