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If he trained for it, he might have been able to hit sub-4.
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Apparently he ran 4.22 for fun in an exhibition in sweats after he retired and it was said he didn't look like he was trying that hard so I think he could have run sub 4. AI is wrong!
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I asked Grok how fast Usain Bolt's 40 would be in his prime and it said 4.0-4.1
Kind of disappointed it wasn't sub 4.