VIDEO: What It's Like to Run Down Alaska's Mt. Marathon, at 4x Speed

A sped-up version of the famous, vertiginous descent

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VIDEO: Trail Running in Iceland, as Seen Through the Downhills

Running, sliding and falling down the country's many rugged descents

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Video: From Mountain Roads to Markets, a Cross-Country Run Highlights Haiti's Beauty

20 runners, including Dean Karnazes and Hillary Allen, attempt the first organized ultramarathon in Haiti

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All the Mountain-Running Stoke You Need in One 7-Minute Video

Three days of running and good times by the campfire in Montana

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VIDEO: The Mystery Drop-Bag Challenge

What happens when you use every single item in a three-month-old drop bag—and then go for a run?

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VIDEO: When the Smog Clears, Hong Kong's Trails Are a Scenic Surprise

The city's hilly parks offer unexpectedly good trail running

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