[Mile High Mania]

Originally Posted by CrossCheck

Easy, one team lives and trains almost exclusively in the thin air of Denver, the other teams are out of town for nearly half of their seasons.
The Broncos leave on Friday and come back immediately after the game on Sunday, the other teams can be gone on longer road trips. In 4-7 days your body will adjust to the new altitudes, so if the other teams are gone for 4+ days they need to re-acclimate to the Denver altitude when they get home.