You know, i've seen a lot of people here say about the pro's guts, "Everyone has a gut when they're breathing hard." Really? Watch this video of Flex at the 1993 Mr. O (when he was off and not at his best), and not once does he have a gut or even slightly distended abs. you can see him breath, and it pushes out his abs...to the distance most BB's today are when tightening theirs!!
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And Flex was NOT a small, lightly-muscled guy.