Wafflecakes' ignorance is impressive, too. Fitness does not equal acclimatization. There is only one way to acclimatize, and that is to be at altitude and preferably, train and practice there for at least a short while. There is absolutely nothing you can do at lower levels to circumvent this process. Lowland-based skaters (or any other athlete) who don't normally train at altitude but who must compete at an altitude venue, probably best should arrive a couple of weeks early in order to allow their bodies to do this, and to make the breathing adjustments necessary to take in enough oxygen. Obviously, the vast majority of competititors do not have the time or money to be able to park themselves early at Colorado Springs to do this.