Q: can a person actually become "adapted" or is this simply physiology?
Q2: Would not an athlete who is termed "adapted" also be a fitter person, thus being stronger, faster, etc.?
Q3: Bonus question. If I am both fat and carb "adapted" before that was what, protein adapted? That is all that is left.

OK, one more. According to my recent VO2 Max test, I switch from burning fat to carbs around 85% of my max HR. So, right around there is where I should train, right? According to the analysis that I was given, that is Zone 2, but in all honest, that is too high for me to sustain over a long period.

Edit: that Z2 was from my actual test. RWGPS calculates that as a Zone 4 HR, which fits better with my perceived rate of exertion or whatever that is called.