Some people meditate. I run.

Writer and runner George Sheehan put it very well: "I discovered how easy it was to escape from the body into a total encounter with my thoughts---thoughts I had never or rarely been conscious of before. Those training runs became my hour for exploring the meaning of my past, the treasures laid up in my subconscious mind."

This passage is taken from an essay called "Self Discovery", which is well worth reading.