For me, the "last run" is called @ the bottom. It seems, all to often, the last run is the one that results in injury. When you call it, your mind gravitates towards a beer, the traffic home, or whatever the rest of the day has in store. Hards carving needs/demands, focus, dedication, not distraction. So, if I say "one more run..." my mind and body aren't focused on the run nearly as much as they should be. That's when mistakes are made.
Don
Feed the addiction...