mindgarden said: "...Does the skinny one run out of energy before the fat one has a heart attack from the pursuit? Maybe it only works on an island, where there's no place to run to...."
I can tell you, as a distance runner, that I could run and run and run and run. Also, I could also run shorter distances pretty quickly.
So, while my "top" weight training friends will often joke that I might be able to outrun them in the long run, but they'd catch me in the first 100 to 400 yards...PSHAW!! No way.
Interesting that Michaelangelo Signorile's interesting and thought provocative book "Life Outside" comments on why the "runner-look" is so despised in the gay community, despite the fact that runners are such good athletes...
Essentially, he says that in the gay world the "fight" part of the "flight or fight" impulse in human survival is the only thing valued. He traces that partially to the "wasting" that occurs as the result of untreated AIDS...but that is another thread.