Altitude for sure. I remember going for a run in Park City under similar conditions (sh!tty United Airlines!) and couldn't figure out why I felt so gassed. I then out two and two together and realized that of course it was harder at 2,100+ m. I think you were even higher than that, no?
Started at 2400 went up to 2850. Energy sapping on the inclines.
Totally. Altitude total mental game. been there. Good on your for doing it. You are pretty darn fast for a guy who does not like it
Thanks Dee. Ended up 4/29 in M40-49 so not awful and just 3 mins out of podium. Regardless it sucked. You ultra people are crazy.
Congrats on being that awesome at something you hate!