The motivation to keep going is hard. I have had trouble with it at times, and now that I'm only 10 pounds away from my "I'll be content then, but still want to lose more" weight, it's almost harder cuz now I think I can cheat a little more.
With the running though, going outside is alot different from what I've done on the treadmill, but I've found that saying "Well I've down it for 5 mins, why can't I just do that again?" It seems to work until I get the "stitches" pain, then I start walking on an incline.