Running is great for me. Especially if it's away from traffic and I can just be by myself with my thoughts.
The thing that saved my life was my bicycle though. It's no problem for me to go for a 3 or 4 hour ride, but I could never run that long. It's so important to me because before I had ever heard of AS, and I was living with it, it was on my very long rides that I learned to cope with whatever it was that caused me so much grief in life.
The solitude was terrific, and it turned out to be a perfect way to mediatate. Think about it, you're finally able to clear all the noise from your head, and the rhythmic breathing involved channels the thoughts. It's very much like what any mediatating religon does, with the same results of self-awareness, and inner peace. I've done a couple hundred mile rides, and any time I've had a revelation about how I should live my life, it always came on the bike.
I think that's why many Aspies like running/riding, we're the only ones who can fully appreciate the solitude and peace of mind. I used to run more when I had a dog, with him it was perfect. Solitude, peace of mind and animal companion. Oh...heaven!
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O Wonder! How many goodly creatures there are here! How beauteous mankind is!