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Tough Mudder
An endurance event series featuring military-style obstacle courses designed to test teamwork and mental grit.
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"Here was Tough Mudder. They came out of Harvard. They were young. They were savvy."
From:
Spartan Race Founder Joe De Sena's Biggest Lessons Growing a $100M Empire
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▶ 14:15
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Feb 2026
Attribution: Joe discusses Tough Mudder as his main competitor that he eventually acquired