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According to new study.
Compete in these high-octane one-of-a-kind events.
Ethiopia claimed all three podium spots in the men's race.
This guy will run 26.2 on the International Space Station treadmill.
New study shows benefits of higher anaerobic fitness levels.
Advance your trail run or hike with these all-terrain tactics.
How do you sweat: "typical," "low-salt," or "salty"?
Comedian Eddie Izzard just finished his 707th mile for charity.