By the way, SLC is at 4200, while Boulder is at 5300. It may not seem like a lot, but there is significantly more oxygen available, and the athletes have now had a few days. Fatigue from Thursday may be a factor, but elevation probably not so much.
https://wildsafe.org/resources/ask-the-e...en-levels/
Las Vegas is at 2000 feet.
https://wildsafe.org/resources/ask-the-e...en-levels/
Las Vegas is at 2000 feet.
