Published November 29, 2012 03:36PM
The World's Toughest Endurance Challenges
"The World's Toughest Endurance Challenges" is a testament to what people can achieve when they push their limits.
With stunning photography, comprehensive information, and interviews with athletes who have completed these races, “The World’s Toughest Endurance Challenges” is a testament to what people can achieve when they push their limits.
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