Riding for hours in Z4 -- are my HR zones off?

[bbarrera]

@OreoCookie

Let me ask you something: how useful do you find heart rate zones in practice (no matter how you compute them)?

I started training outside, without a power meter and HR was useful on long intervals from zone2 up thru threshold. So if I didn’t have a power meter, HR zones are more reliable for me than RPE. Also, I take an off-season and restart by doing zone2 by HR rather than power.