TIL distance-running has skyrocketed in popularity 3 times in modern history, each time in the midst of a major crisis: during the Great Depression, in the 1970s during a recession, race riots, assassinations, and Vietnam, and 1 year after 9/11 it became the fastest-growing outdoor sport in the US.

http://news.bbc.co.uk/2/hi/uk_news/magazine/8158777.stm

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