@theclymb tweets related to: Challenges, Marathon

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Running a marathon is tough as it is, but running a marathon featuring daunting hills or extreme weather conditions? Yikes. But just in case you're up for the challenge (or you want to be in awe of the things humans are capable of), check out the 7 of the toughest marathons the world has to offer: Everest Marathon Mount Everest The highest marathon in the world, this race is not for the faint of heart.
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RT @WengerBrand: We know you like challenges, so here are the 7 hardest marathons in the world http://t.co/EYDBOtq5pc

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