Originally Posted by Kapusta

I think several posters (including the OP) may not know what what "runner's high" specifically means. It happens WHILE you are running and it is something that happens during extended, highly repetitive, rhythmic, consistent aerobic exertions. It is a little hard to explain if you have not experienced it, but I think it is much less likely to be a part of cycling than running. Not saying it can't happen, but there is a reason it is referred to as a "runner's high" and not a "biking high".