This is why

(can you tell I'm totally scatter-brained today?) I ended up with a stress fracture. (Needless to say, I am not Lance Armstrong, but the fundamental combination of a new addiction to long-distance running, a very strong drive to succeed and a high pain threshold sounds familiar; my skeletal system was lagging behind my aerobic conditioning and my muscles, how maddeningly annoying--I've got a doctor's appointment at the end of the week, but I think that all common sense is telling me I must wait some weeks more before starting to run again at all, which is very disheartening.)