Thanks Blueberry, I had no idea how to look at that number. Not that I am all that concerned about it for now, and it is interesting how much harder it is to run a mile (ran more than walked, probably walked about a quarter of the distance) inside on a rubberized track over soft trails. I won't even consider running on pavement, that just isn't for me. That one mile inside got my heart rate much higher than the trail and I was certainly done after that mile. I seem to last longer on trails, or else I am better at the walk/run mix when I am out in the woods by myself...