Up and Running: The Rise of the Themed Road Race

The smart principle behind The Color Run and Tough Mudder's explosive growth.

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The Color Run is a 5K race in which participants are doused with colored powders after each lap.

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"I like the model, I think it works well, at least for a 10-to-15-year window," he says. However, he does see the potential for trouble ahead as runners' knees wear down, even if their enthusiasm does not wane. "At some point you may see a dropoff – people get wear and tear on their bodies."

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