Humans aren't built to sit all day. Nor are we built for the kinds of repetitive, small movements that so much of today's specialized work demands. Our bodies crave big, varied movements that originate at the core of our body.

For me, it's about optimizing health. It's about lifestyle and longevity. Then you think about what vegetarian diets can do for the mass population, in terms of lower consumption of resources. When you look at the numbers, it's pretty staggering.

You could carry your burdens lightly or with great effort. You could worry about tomorrow or not. You could imagine horrible fates or garland-filled tomorrows. None of it mattered as long as you moved, as long as you did something. Asking why was fine, but it wasn't action. Nothing brought the rewards of moving, of running. Sometimes you just do things.

Humans aren't built to sit all day. Nor are we built for the kinds of repetitive, small movements that so much of today's specialized work demands. Our bodies crave big, varied movements that originate at the core of our body.

Every single one of us possesses the strength to attempt something he isn't sure he can accomplish.

Most of all, the ultra distance leaves you alone with your thoughts to an excruciating extent. Whatever song you have in your head had better be a good one. Whatever story you are telling yourself had better be a story about going on. There is no room for negativity. The reason most people quit has nothing to do with their body.

What we eat is a matter of life and death.