Flow happens to at least a lot of runners to be fair though. At certain distance when I'm running, it becomes very pleasurable, like you are above everything.
I've never really experienced anything like what they're describing with Diane Van Deren. I'm not sure I've ever really experienced what folks refer to as the runner's high either. At best, I can say that there are times that my running is as effortless as walking, even when running at a fairly decent clip. During those effortless times, I've gotten lost in thought or in conversation with another runner, but no differently than I'd get lost in thought or conversation during other activities. I've never experienced any sense of euphoria when running. Joy and tears and emotional overload at the end of Boston sure, but not what I'd call euphoria.
That runner's high sounds great though, for those who do experience it. :-)
You have ran some very impressive distances though.
https://en.wikipedia.org/wiki/Neurobiological_effects_of_phy...