I never think unless I consciously make myself think about something, seriously when I'm at school my mind isn't going through random stuff like "man i wana fuck that teacher, I wonder if anyone has, yeh who wouldn't want to, woh man im hungry i need a pie, i wonder who made the first pie" no, my mind is blank, it's quite awesome. But when I do make myself think I can do it anywhere but it's harder to do when a TV show that I hate is on or a song that I hate is playing.
When I'm running fast I can think very clearly since my instincts take care of avoiding obstacles for me.