Tough Mudder's Filthy Challenge to Get Dirtier

May 15 (Bloomberg) -- This year millions of Americans will shell out hundreds of dollars to crawl through mud and run through fire. Military-style obstacle races are all the rage and mud-run companies have to fight harder and to compete. Tough Mudder CEO Will Dean tells Bloomberg how he keeps runners loyal to his brand in this week's "Small to Big" installment.

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39:00 - Guests include: Billionaire environmental activist Tom Steyer, Cuemacro founder Saeed Amen, Ballard Spahr's Dee Spagnuolo and Meghan Duggan, captain of the U.S. Women's National Hockey team. (Source: Bloomberg)
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