Calculating HR Zones from Ramp Test

Training
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My understanding is that HR @ FTP is within spitting distance of LTHR. It would definitely be a better estimate than using a percentage of max HR or trying to fumble some math through the ramp test. I’ve heard this equivalence a lot from the Coggan, Friel, etc, and while other people may be right on some details, I think for most people, it’s pretty accurate: Common But Confusing Training Terms - Joe Friel