Wim HofInstructor and teacher, Wim Hof Method

From the Polar circle to the Namibian desert #worldrecord

11 Mar 2026 · 1 min

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Wim Hof swam, ran, and climbed a full marathon in the polar circle, then ran 42 km through the Namibian desert without water, losing 5.2 liters of sweat while keeping his core temperature stable. He argues cold-exposure training transfers to heat stress.

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After I did a full record, in short, beyond the polar circle, a full marathon, I did all the things. I did swimming, I did running, I did climbing, I did all the things in the cold. Now let me go into the heat. So half a year later, I had it organized together with a physiologist to Namibia and run in the Sossusvlei desert. I had 2 coffees and just started to run, and for 42 kilometers which is 26 miles, I think, without drinking any water. When I was running and losing 5.2 liters of water out of transpiring, sweating, but my core body temperature remained the same. That means what I did in the cold was learning how to deal with temperature, with stress, and it also worked in the heat. It was amazing.