Because you’ll get a medal that says “13.1” on it. And you can wear it to brunch. That’s the official rule of running—brunch is mandatory.
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Because you’ll learn that your body is capable of weird, wonderful things. Our ancestors ran down antelope; you can run 13.1 miles. It’s in your DNA.
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Think of it as two 10Ks plus a 5K. Or as 10 miles plus a quick 3.1. Or as one very long episode of your favorite podcast. Brains love hacks like that.
Just don’t think about the 69,168 feet. That’s too many feet for a Monday.