STEVEN LEVY: Bots That Botch Your Workout. “On the plus side, the software is much less costly, has an infinitely flexible schedule, and can’t recount your flabby, pathetic exploits to its friends between gales of laughter. On the other hand, a human trainer is more likely to acknowledge when the client is crumpled on the floor writhing in pain after doing a leg stretch. A virtual trainer’s response in such cases is to impatiently urge that another rep be completed. Trust me on this.”