Yeah, I was going to say - does this person truly believe that his body is composed solely of muscle and fat? Did he "sonar" a 15% body fat for himself and then decide the rest was muscle? Maybe he just decided he's 0% body fat instead. He mentions bones, so maybe he's decided he's 15% bone and 85% muscle. He's a new species! We'd better capture and dissect him so we can learn more.