Earlier quoted context omitted.
You can't prepare for acclimatization, and you don't know how well your body will handle it before actually going up there. You will suffer regardless, acclimatization just makes things possible and over time mentally more bearable experience. But prepare for 3-5 steps and rest routine in higher parts, pushing through is actually pretty stupid and will fire back quickly and badly, listen to your body. That being said…
> You can't prepare for acclimatization, and you don't know how well your body will handle it before actually going up there. This is something of an enduring medical mystery despite efforts to find related genes, etc. I think part of it is the compounding of second order effects, like who can say whether individual performance one week into an expedition will be more affected by bad sleep, bad digestion, or bad head…
Now why the number is as it is in altitude while next guy was more fit down below, but now vomiting furiously is another question, I agree not very clear. Maybe red blood cell pace of production but even that is not a complete picture.