Ultrarunners have more allergies, asthma, knee pain & stress fractures

"One of the first large-scale studies of ultrarunners -- those superhumans who race distances longer than the standard 26.2-mile marathon -- shows that these runners are more likely to suffer from more allergies and asthma."

"They also report more knee pain and stress fractures, but when you're running 50 miles at a time, that seems about right."

Source: Ultrarunners aren't always ultrahealthy

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