For nearly 2 million years, our ancestors survived and thrived and spread across the planet because they could run other mammals into heat exhaustion.

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.

I have the idea that running shoes are based on a kind of cult idea - that our feet are flawed and we need shoes to correct those flaws. The shoe companies are in the business of selling shoes. But there's no evidence from running shoe manufacturers that they're right. There's no scientific data that running shoes reduce injury.

Every morning in Africa, a gazelle wakes up, it knows it must outrun the fastest lion or it will be killed. Every morning in Africa, a lion wakes up. It knows it must run faster than the slowest gazelle, or it will starve. It doesn't matter whether you're the lion or a gazelle-when the sun comes up, you'd better be running.

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

...there was some kind of connection between the capacity to love and the capacity to love *running*. The engineering was certainly the same: both depended on loosening your grip on your own desires, putting aside what you wanted and appreciating what you've got, being patient and forgiving and... undemanding...maybe we shouldn't be surprised that getting better at one could make you better at the other.

If you read folklore and mythology, any kind of myths, any kind of tall tales, running is always associated with freedom and vitality and youthfulness and eternal vigor. It's only in our lifetime that running has become associated with fear and pain.