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Nature 444, 1000-1001 (21 December 2006) | doi:10.1038/4441000a; Published online 21 December 2006

Physiology: Freaks of nature?

Helen Pearson1

  1. Helen Pearson is a reporter for Nature in New York.
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Ultraendurance racers torture their bodies and minds to achieve near-impossible physical feats. Is it an exceptional genetic make-up or the vestiges of human evolution? Helen Pearson reports.

Trek 125 kilometres, and cycle 250 more. Kayak 131, rappel through canyons for another 97, and swim 13 in churning whitewater.