Imagine what it would do to you if at mile 20 of a marathon, someone ran up beside you and said "You must feel really tired. Would you like to stop and take a rest?"
I've been at mile20 many times and every time I think next Marathon I'm going to arrange for someone to meet me here with a picnic, and have a rest, then really cane the last 10km. Never quite gotten round to it yet!
I wonder if PG knows about The Wall that occurs at ~mile 20 in a marathon, or if it was a lucky coincidence? http://adventure.howstuffworks.com/outdoor-activities/runnin...