[kelseyfrog]

I've experienced runner's high. Not regularly, but on occasion. After completing the couch to 5k(C25K)[1] program and running a 5K every other day for a couple years.

One in a while, I've have a great day, the music would kick in, and I'd get a runner's high. It feels like a sense of euphoria combined with frisson - the same sort of frisson I'll get when listening to just the right song at the right time. The crown of of my head would have an intense tingling feeling not some times when I've smoked cannabis.

It never lasted for long - maybe 3-5 mins tops, and I'd expect that it would fade quickly if I had stopped running. I don't believe it was associated with any distorted thinking that drugs are typically associated with - it's simply a powerful boost in positive mood.

1. http://www.c25k.com/