I don't think ignoring HR is the best idea, particularly in this instance. Yes, you should watch for physical signs, but RPE is not something you can set as standard for all people.
Its not the clients job to look for signs and to relay you when they are about to fall flat on their face, it is yours and if smart, and method of measure.
But then you would never see me putting a obese person through HIIT or anything remotely close in the first place. Turn off The Biggest Loser.
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