Endurance, after all, is the only reason we even exist. We think of ourselves as nature's deadliest animals, but the truth is, a naked human is the biggest wimp in the wild. We have no fangs, no claws, no strength, and no speed.

If you don't think you were born to run you're not only denying history. You're denying who you are.

The words of the social critic Eric Hoffer were ringing true: "Every great cause begins as a movement, becomes a business, and turns into a racket."

You don't stop running because you get old, you get old because you stop running.

I received the best advice for running I ever heard: 'You're not going to win, so just relax. If it feels like work, you're running too hard.

Even Charles Darwin, that human decoder ring of bizarre behavior, found the idea of saving a stranger's life to be a total head-scratcher.

One of the most dangerous and best-kept secrets of the medical profession is the epidemic of anesthesiologists who are addicted to their own drugs.