Why do you run, when did you start?
I began running on an everyday basis after I became a writer. As being a writer requires sitting at a desk for hours a day, without getting some exercise you'd quickly get out of shape and gain weight, I figured. That was 22 years ago. I also took it as a chance to quit smoking. You see, I became rapidly healthier since the time I became a writer. You may call it rather a rare case. But because of that, I weigh now just as much as I weighed back then.
Before I became a writer, I was running a jazz bar in the center of Tokyo, which means that I worked in filthy air all the time late into the night. I was very excited when I started making a living out of my writing, and I decided, "I will live in nothing but an absolutely healthy way." Getting up at 5 a.m. every morning, doing some work first, then going off running. It was very refreshing for me.
I have always liked running, so it wasn't particularly difficult to make it a habit. All you need is a pair of running shoes and you can do it anywhere. It does not require anybody to do it with, and so I found the sport perfectly fits me as a person who tends to be independent and individualistic.
........... quote from his book
People sometimes sneer at those who run every day, claiming they'll go to any length to live longer. But don't think that's the reason most people run. 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 then in a fog, and I believe running helps you to 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 whole. I believe many runners would agree"
— Haruki Murakami (What I Talk About When I Talk About Running)