There is provided a motorless treadmill. The motorless treadmill includes: a motorless track having a curved shape such that an inclination angle increases with respect to a ground surface toward a front end and a rear end, and configured to move around a closed path by a user's footsteps; and a pair of side covers disposed on two opposing sides of the motorless track, wherein the motorless track changes movement speed according to a location at which the user steps on the motorless track, and wherein, on at least one side cover of the pair of side covers, a speed-related indicator is disposed to indicate information related to the movement speed of the motorless track.