Odd question I thought of as I though back to my gym class days... I remember when we always did the 12 minute runs to see how many laps we could get... I would always be really tired toward the end... but during the last like 30 seconds I would push myself to start sprinting. When I did this, I went kinda numb almost.. like blocking out all the physical pain, and it felt like almost no effort to be sprinting. My question is, if you were to do this for a long period of time, would you pass out or something? It's a weird question, but your input is appreciated. Thanks!