We had 14 Scandinavian mid-distance and cross-country athletes here at the backpackers over Dec'16/Jan'17. They spent 3 weeks working through a grueling altitude training regime, one of four altitude sessions per year for them. I am often asked by our cycling guests what the benefits are of altitude training other than increased red blood cell and oxygen advantages. Answers after a few Google searches have varied. Personally, living at 2100m above sea level makes me feel like a champ when I'm at lower alt. First day/night or two at lower alt, I feel like the Duracell bunny. What is your take?