Running is a very natural activity. If you get too caught up, you find yourself constantly seeking to make running something that it isn't. You should let it be what it is - a very simple activity. Running has become too complicated for many people and they wind up turning sour on the sport, or losing the focus of their direction.
Bill RodgersMy guess is many top athletes, distance runners included, use performance-enhancing drugs, enough so that the problem must be tackled.
Bill Rodgers