Rafa never sets foot in the gym and the closest thing to weight training he does is resistance bands. give those same bands to the general population and see if their biceps grow to that size. I'm guessing no for the vast, vast majority.
it's the same as getting unnaturally huge by taking roids...of course it still requires a large amount of dedication and work ethic to look like a parade balloon, but you're not getting anywhere near that without the base factor/advantage.
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