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Early on in his new book Sweat: A History of Exercise, the author Bill Hayes discovers an old tome from the 1500s, De Arte Gymnastica, that talks about breaking a sweat in a very modern way.

Run for your life. And swim, bike, and walk for it, too. Of course, if you don’t want to stick around for a healthy old age, don’t sweat it. Just don’t do it. You’ll get to the end a lot faster. But ...

Martin Fritz Huber is a frequent contributor to Outside who previously wrote the In Stride column about running culture. He also works as a tree care professional in New York City. New perk: Easily ...