The Boerne Race is 0.5k long, and begins and ends with a glass of beer. Josiah Mackenzie/Flickr hide caption
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Desiree Linden wins the women's division of the Boston Marathon on Monday. She is the first American woman to win the race since 1985. Charles Krupa/AP hide caption
Man Kaur of India celebrates after competing in the 100-meter sprint in the 100+ age category at the World Masters Games in Auckland, New Zealand, in April. Michael Bradley/AFP/Getty Images hide caption
Runners in the Gerrymander 5K will trace the boundary of two congressional districts that split Asheville, N.C. Ken Lane/Flickr hide caption
David Torrence, seen here during the 2014 Penn Relays at Franklin Field in Philadelphia, has died in Scottsdale, Ariz. Icon Sports Wire/Corbis via Getty Images hide caption
An African cheetah (acinonyx jubatus lanea) at Inverdoorn Game Reservein South Africa. Thierry Falise/LightRocket via Getty Images hide caption
Researchers had participants wear the fitness trackers while walking or running on a treadmill and while riding an exercise bike to determine how well the trackers measured heart rate and energy expenditure. Paul Sakuma/Courtesy of Stanford University School of Medicine hide caption
Fitness Trackers: Good at Measuring Heart Rate, Not So Good At Measuring Calories
Runners assemble at the starting line of the third annual Qingyuan marathon. Rob Schmitz/NPR hide caption
In Fast-Paced China, Marathon Craze Is Off And Running (Despite A Clumsy Start)
The laces on the left are tied in a strong knot that lies horizontally. The laces on the right are tied in a knot that makes the bow lie vertically and which, according to new research, can come untied more easily. Meredith Rizzo/NPR hide caption
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
In Diabetes Fight, Lifestyle Changes Prove Hard To Come By In Mexico
Interval training includes bursts of high-intensity efforts sandwiched by periods of less activity. Jonathan Cohen/Flickr hide caption
Does 1-Minute Interval Training Work? We Ask The Guy Who Tested It
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
The runners in Project Kirotshe take off through forested mountains. For participating in the club, they each get a stipend to pay school fees. Daniel Socha for NPR hide caption
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
A Protein That Moves From Muscle To Brain May Tie Exercise To Memory
Ida Keeling does pushups after breaking the world record for the 100-meter dash for centenarians at Penn Relays in Philadelphia on Saturday. Courtesy of Penn Relays hide caption