Do you know your FTP?
Top of Z2 is the upper lactate threshold ... AKA your threshold.
Yeah I’m at 280 at present. So is it Z1 less than 70%, Z2 70-105%, Z3 above?
Yeah, that's my understanding.
It's based on two steps in lactate production I think. Ideally that's what you'd get tested for.
@GoatandTricycle started
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Do you know your FTP?
Top of Z2 is the upper lactate threshold ... AKA your threshold.