I’m on week 5 of the 24 week mountaineering. If I go by the talking and breathing test, my upper zone 2 is around 174. I could easily maintain a 170 hr and and carry on a conversation and breathe through my nose. This just seems way too high, i feel as if my upper zone 2 hr should be lower. I live at 6,000+ feet if that matters. Can anyone provide some information on this? Thanks