The merits of non-motorized system are not only energy efficiency, but also management-free, noise-free, light-weight, and robustness. No need to touch or press the buttons. It’s natural, simple.
Free to run
The user controls the speed by the body’s position on the curved running surface. Stepping forward initiates movement, as the user moves upper side of the curve speed increases. To slow down, simply drift back toward the rear curve.