Thanks everyone, but i have more than enough real world HR data from my client to establish the Max HR she has ever achieved on the bike. I’m not interested in creating a program or method based on some theoretical max she might achieve in perfect lab conditions. I’m using what her body is actually DOING when pushed to the point where she breaks. My REAL question is: Does anybody have any knowledge of studies showing if there is a spectrum shift in HR Zone workout training for someone who’s natural HR is high before they get off the couch.