This is 100% unrelated to the original article but I feel like there's an underreported additional first half. As a bigger runner who still loves to run, the first two or three miles before I have enough endorphins to get into the zen state that makes me love running is the first half, then it's 17 miles of this amazing meditative mindset. Then the last 10k sucks.

Just, ftr, endorphins cannot pass the blood brain barrier

http://hopkinsmedicine.org/health/wellness-and-prevention/th...