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.

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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.

Learn more at Velopress.com.

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