This race has made its reputation as ‘The World’s Toughest Mountain Race’. A true challenge to the spirit of human endurance, this race involves running up and down Mt. Kinabalu (4095.2 m), where the total distance is 21km for all Men, Women and Men Veteran categories. The average climbers take 2 days to climb the mountain but participant of the race can make it in less than 3 hours. The Climbathon is part of the Buff Sky Runner World Series circuit for the seven consecutive year and is one of the two races in the circuit held outside Europe. Buff Sky Runner World Series is regulated and coordinated by the euopean based Federal for Sport at Altitude (FSA).