How you can tell you may be an obsessed runner-
Did a ~20 mile training run today.
Saw others out running on my drive home.
I've done two other 20 milers in the past few weeks- each time, it happened. Weird, eh?
Speaking of weird, my quads have been hurting every since Tuesday because of speed work an plyometrics. After doing the long run today, my quads don't hurt anymore. Strange stuff...