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How do Bodybuilders workout in the gym for 4-6 hours without overtraining their muscles?

I mean,I know their professionals basically who know what they’re doing,but…I get so worried about over training,I only workout about 30-45 minutes when hardcore lifting due to be cautious,should I be pushing it farther?
Alright cool thanks,yeah forgot about that possibility

there on steroids
aint no way in hell anyone can workout that long and not puke up their guts
i know i tried doing a full body workout
and that took about 6 hours
i about killed myself there lol