This is a great account by Nicholas Thompson, Wired's editor in chief, about his complex relationship with running, self, and his father:
"I used to think of athletic ability as a mountain. You're born at the base, and you'll die there too. In between, you climb higher and higher until you begin to descend. But that analogy isn't quite right, because as you get older you acquire wisdom that can help you train. I've come to realize that a better analogy is of rolling peaks. You go up, you go down. At some point you reach your peak, but there are still vistas as you descend."