What Makes the Bolder Boulder 10K Such a Special Race?

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The Bolder Boulder 10K, now it its 37th year, has been run every Memorial Day in Boulder, Colo., since 1979. It’s been one of the largest races in the world for years, with more than 50,000 runners expected to run in this year’s race. We caught with some of the U.S. pro runners racing in this year’s International Team Challenge to talk about what makes this race so special.