The Tough Mudder Endurance Series a collection of events designed to push you past your limits and unlock the champion within. Participating in the Endurance Series requires serious mental and physical commitment, which will eventually lead you to taking on the most extreme 24 hour event the OCR world has to offer. Completing the Tough Mudder Endurance Series will earn you the ultimate prize in the Tough Mudder universe: The Holy Grail. Do you have what it takes to claim yours?

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