After watching the Krupicka, Roes, Mackey and Jurek interview: http://www.irunfar.com/2011/01/video-qa-with-jurek-krupicka-roes-mackey.html. I started thinking about what Anton said about "junk miles," and how some people might consider a lot of the miles he puts in junk miles.
Do I run junk miles? Doubtful, considering how little I usually run... but what about the 4 miles I run in the morning before I head into work, do those really help me in any way? Anyone have a good definition of junk miles?