Thanks for the writeup! Almost all of my hunting is done at altitude (on the island of Hawaii) but I live on Oahu now where it is relatively flat. Even if I were doing 15-20 miles a week on Oahu, I couldn't last more than a few miles at 7500 ft before I was gasping for air and walking at a snails pace. Oddly enough, recovery time was very quick once I stopped walking....
I think I'll include more interval runs/farklets into my training. Mahalo!
Brian