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EIDFJORD, NORWAY - FEBRUARY 27: Athletes struggeling with the many steep hills during Expedition Amundsen on February 27, 2016 in Eidfjord, Norway. Expedition Amundsen is called the world`s hardest skirace. 40km across the Hardangervidda, 40kg in the sled and 100km. The race follows the path of the explorer Roald Amundsen. (Photo by Kai-Otto Melau/Getty Images)

EIDFJORD, NORWAY - FEBRUARY 27:  Athletes struggeling with the many steep hills during Expedition Amundsen on February 27, 2016 in Eidfjord, Norway.  Expedition Amundsen is called the world`s hardest skirace. 40km across the Hardangervidda, 40kg in the sled and 100km. The race follows the path of the explorer Roald Amundsen.  (Photo by Kai-Otto Melau/Getty Images)