Most runners run not because they want to live longer, but because they want to live life to the fullest. If you're going to while away the years, it's far better to live them with clear goals and fully alive than in a fog, and I believe running helps you do that. Exerting yourself to the fullest within your individual limits: that's the essence of running, and a metaphor for life—and for me, for writing as well. I believe many runners would agree.
— Haruki Murakami, What I Talk About When I Talk About Running: A Memoir