I am here to tell you that you can command your body to perform no matter what kind of pain you are in. It takes desire, determination, and the willingness to push yourself to your limits in order to succeed. … It’s a matter of how much you want it. If you don’t have the desire then the pain will be your main focus and you will give in to it and never experience those second, third and fourth lives. If finishing is what you are concentrating on than I can guarantee you that you will overcome.
“How to Run 100 Miles” - RelentlessRunner.com (Dave Bursler)