When I run, I no longer listen to music and I just let my mind wander. My layman's theory is that it's a form of meditation. At the end I'm full of mental energy and new ideas.
While I'm sure that what you describe works for you, one meditation technique is precisely the opposite of what you are doing. Next time you go out to run, try to be perfectly in the moment feeling every sensation and try not to create little movies in your head.
I completely agree. I do most of my running on my own, early in the morning and it is a great time to get ready for the day just noticing the world, your body, waking up, and accepting those things and moving on. I also try to do sitting meditation before (usually out of bed, meditate, warm up, run), but if I have to choose I run before meditate and call it even.