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'Super-human' marathon runner Dean Karnazes can jog 350 miles without stopping thanks to a rare genetic condition

17-05-2016

(Worldkings) 53-year-old Dean Karnazes has a genetic condition that means that he doesn't get cramps, muscle burn or hyperventilating when he runs. He even managed to sprint 350 miles in 80 hours and 44 minutes - without any rest.

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