All the guys on the real world and the duel etc.?

Why do all the guys have life these perfect y bodies like Ct,Wes,Davis,Brad,Evan,Mj,Landon,etc its like everyone has a bangin body even on like parental control all the guys have hott bodies is that just how everyone looks in california our is that a marketing ploy do you think there just like male models these cant be regular people.