[{"Bold_text": "noun", "List Items": ["an apparatus for producing rotary motion by the weight of people or animals, treading a succession of moving steps or a belt that forms a kind of continuous path, as around the periphery of a pair of horizontal cylinders.", "an exercise machine that allows the user to walk or run in place, usually on a continuous moving belt.", "any monotonous, wearisome routine in which there is little or no satisfactory progress."]}]