Why does almost every mixed martial arts has hang overs on there stomach and not just haredcore abs?

like look at chuck liddel rampage forrest griffen bj peen tito ortiz and those guys are well conditioned so ur tellin me that it takes steroids to get that lean washboard abs and i'm not talkin bout wwe everyone know they take steroids but is becuze of the bbj and rollin or sumthing plz let me know