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The 10 Most Grueling Endurance Races In The World

10. The Ironman Triathalon Arguably the world’s most famous one-day endurance event, the Ironman World Championship is a true test of all-around ability and fortitude. To complete the famed race in Kona, Hawaii, competitors must swim 2.4 miles, bike 112 miles, and then run 26.2 miles. And before you can even think about racing Kona, you need to qualify by …

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