Ya, I am aware that many folks are at lower elevations and therefore there isn't much they can do to prepare themselves concerning the O2 level issue, however the gyms in Denver are as limited as they are at any other elevation. That was why I threw a statement in about folks in the deep south but I probably should have expanded that to include all areas not at higher elevation. I suspect the OP, whom I was responding to, is fairly close to the Canadian Rockies but I cold be wrong about that.
Regardless of where you're located, I still think hiking around in whatever woods/swamps/timber you have available is a better mainstay to your routine than concentrating totally on the gym. Walking around in that mucky, swampy mess you all have down there is tiring on your legs and core, especially if you have weight on your back. BTDT and I felt it worked my body overall much better than gym exercises.
Good luck to all this fall, whichever route you choose.
