go into a lab and test if you really want numbers… or do what I do, and don’t obsess about it. My all day pace climbing in the mountains is 135bpm, while the talk test / first deep breath is closer to 120bpm. I’ve decided to train knowing that metabolism works on a continuum, varies day to day, and doesn’t operate in strict zones. And so for me, no issues training low aerobic in 120-135bpm HR range.
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