Try the meditation of the trail, just walk along looking at the trail at your feet and don't look about and just fall into a trance as the ground zips by," Kerouac wrote. "Trails are like that: you're floating along in a Shakespearean Arden paradise and expect to see nymphs and fluteboys, then suddenly you're struggling in a hot broiling sun of hell in dust and nettles and poison oak... just like life.

The Tarahumara would party like this all night, then rouse themselves the next morning to face off in a running race that could last not two miles, not two hours, but two full days. According to the Mexican historian Francisco Almada, a Tarahumara champion once ran 435 miles, the equivalent of setting out for a jog in New York City and not stopping till you were closing in on Detroit.

Were designed for persistence hunting, which is a mix of running and walking. Whats built into that kind of running is a sense of pleasure. You are designed and built and perfect for this activity, and it should be enjoyable and fun.

If you can run six miles on a summer day, then you, my friend, are a lethal weapon in the animal kingdom.

Only recently have we come up with the technology to turn lazing around into a way of life. We've taken our sinewy, durable, hunter-gatherer bodies and plunked them into an artificial world of leisure.

it’s easy to get outside yourself when you’re thinking about someone else.

There's something so universal about that sensation, the way running unites our two most primal impulses: fear and pleasure. We run when we're scared, we run when we're ecstatic, we run away from our problems and run around for a good time.