Art DeVany, a former colleague of mine at UC Irvine. Art was into the "caveman diet" (don’t eat anything a caveman could not) before it was fashionable. His blog covers economics, sports, and diet, among other topics. Here is his post arguing that steroids have not increased home run hitting in baseball. Here is a related post. Art, by the way, once played minor league ball.
Art favors fast, short sprints to keep in shape. Here are his ten reasons not to run marathons; I can think of an eleventh and possibly a twelfth as well.
Thanks to Craig Newmark for the pointer.