Ha! My cabin is at 9,500 MSL, and for 35 years we backpacked for 2 weeks or more every
year in the Wind River range, never going below 10K MSL for the entire time. I am pretty
well acclimated to altitude.....but you still can't do as much a 10,000 ft as you can at sea level,
you just accept it. Riding the mtn bike is kinda funny at the cabin. At sea level I can wear out my muscles
before my lungs give up, at altitude, my leg muscles are fine at the point where, if I continue to
go that hard, I will pass out, lungs pumping as hard as they can, cannot keep up.
Bill