A treadmill according to the present invention includes: a frame; an endless be an endless-belt drive unit; a plurality of cameras provided on the frame such that the orientations and/or positions thereof can be adjusted; a motion-data acquisition unit that markerlessly acquires motion data of an object by using image information obtained with camera images; a motion analysis unit that analyzes the motion of the object by using the motion data; and a control unit that controls the endless-belt drive unit on the basis of the motion data.
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