Great question. It depends on the altitude at which you plan to run. If you are planning 14,000 feet, that is different than 5,000 feet. Most people start to feel the more intense effects of altitu...Read More
If you have a question about "Trail Running or Racing", just ask Nancy. She is pretty much the queen of the trail with articles in every major running magazine, has co-authored a book and is the manager U.S. Mountain Running Team.