“I’m often asked what I think about as I run. Usually the people who ask this have never run long distances themselves. I always ponder the question. What exactly do I think about when I’m running? I don’t have a clue.”
― Haruki Murakami, What I Talk About When I Talk About Running

I could not agree more with Mr. Murakami.  I have often thought about inventing something to record my stream of consciousness while running (Apple Watch maybe)?  Running helps me to loosen the cobwebs for sure, but I usually have no idea what has been running through my head by the time I get home.