ok i understand what your saying now, and i'm actually both sided it seems haha. i was a runner and i would get "runners high" where i could run forever. For me it was more of a mental focus and focusing on something else. i've heard alot of other runners talk about hitting walls though. I can see ur argument by saying if u like shut down nerves and such u could keep going.
I'm interested in where this is going to go. I'll be checking on it BBW77
Wild