Yesterday I did a hard 30 minutes after a 15 minute warm up, basically a test to find approximate LTHR (max HR-20, more or less). It was hard, but the running felt so much more natural than it did last year, I was honestly surprised. I was able to maintain a higher heart rate/faster pace for longer without feeling like I wanted to give up. The last 5 minutes were pretty brutal, but I never felt lightheaded and I was able to push myself to a more appropriate/uncomfortable pace/rate without flipping off the treadmill or negotiating "5 fewer minutes" or "I'll just approximate".

I can't run as fast on the treadmill as I can on dry land. Maybe the temperature gets to me. I guess if I was training for a warm-weather marathon, I'd spend more time at the gym (yuck). I hear that a lot of people can run FASTER on the treadmill, but this concept is foreign to me.