Dr. Tonatiuh Barrientos Gutierrez, an epidemiologist in Mexico City, jogs near his home in the southern part of the capital. He says it's hard to run on the city's streets. Meghan Dhaliwal/for NPR hide caption

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Meghan Dhaliwal/for NPR

In Diabetes Fight, Lifestyle Changes Prove Hard To Come By In Mexico

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Interval training includes bursts of high-intensity efforts sandwiched by periods of less activity. Jonathan Cohen/Flickr hide caption

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Jonathan Cohen/Flickr

Does 1-Minute Interval Training Work? We Ask The Guy Who Tested It

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Jolly old Santa himself. Unpictured: the sweat, pain and — possibly? — tears that went into tracing his form on the map. Owen Delaney/Courtesy of Strava hide caption

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Owen Delaney/Courtesy of Strava

Researchers have long known that exercise is good for the brain. An enzyme produced by muscles might help explain why. Monalyn Gracia/Corbis/VCG/Getty Images hide caption

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Monalyn Gracia/Corbis/VCG/Getty Images

A Protein That Moves From Muscle To Brain May Tie Exercise To Memory

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The researchers were inspired by working with ultramarathoners, who can be sidelined by blisters despite years of training. These runners competed in the 2007 Badwater Ultramarathon in Death Valley, Calif. Chris Carlson/AP hide caption

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Chris Carlson/AP

Izaic Yorks, a senior at the University of Washington, recently ran a mile in 3:53 — the fastest mile of any American collegiate athlete. Here, he competes on Feb. 27 in Seattle. Stephen Brashear/Red Box Pictures hide caption

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Stephen Brashear/Red Box Pictures

Why Fastest U.S. College Mile Runner Won't Be Vying To Be NCAA Champ

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Haneen Radi, an Arab Israeli, wants to organize a marathon for her town of Tira, but was told the run couldn't include women. When she insisted, she received threats, and the back window of her car was shot out. Emily Harris/NPR hide caption

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Emily Harris/NPR

Trying To Organize A Marathon, An Arab-Israeli Woman Runs Into Opposition

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From Skid Row To Rome: The Story Of An Unusual Running Club

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British Runner Leaps Feet-First Into Marriage

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English athlete Roger Bannister among a crowd at Oxford after becoming the first person in the world to run a mile in under 4 minutes (3:59.4). Norman Potter/Getty Images hide caption

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Carol Downing is still haunted by memories of last year's marathon. But she's excited about reuniting with other survivors. Michael Dwyer/AP hide caption

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Michael Dwyer/AP

Despite Worries, Boston Survivor Heads Back To The Start Line

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