5 to Read: Should you run outside in a polluted city?

Plus how to get your running in during the holidays

“Humans are built for endurance, not speed. We're awful sprinters compared to every other animal. We try to run our races as if they were speed races, but they are not. They're endurance races. Even a marathon, the way it's run now, it's not an endurance contest.” — Christopher McDougall

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