In 1994, Italian police officer and former Olympic pentathlete Mauro Prosperi was looking to push his physical limits. He decided to enter the Marathon des Sables (French for Marathon of the Sands, also known as Sahara Marathon), a six-day, 251 km (156 mi) ultramarathon, which is approximately the distance of six regular marathons. The multi-day race is held every year in southern Morocco, in the Sahara Desert. It has been regarded as the toughest foot race on Earth. What followed was a near deadly experience that pushed Prosperi to his breaking point. This week, Chris guides us through the ultramarathon that almost killed Mauro Prosperi. (Hint: Do not try this at home.)

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