I did a 1/2 marathon today for the hell of it. I don't normally listen to music during cardio but I can't imaging completing this without it. Especially at 11 miles when I wanted to quit, but "Eye of the Tiger" came on. The thing that surprised me the most is how much my shoulders hurt after. I don't normally post things, but I also very rarely go over six miles. (2:03:34 13.1 miles)