Originally Posted by
terrymorse
Is setting your zones based on max HR that useful, any way?
I like to set mine based on LT (lactate threshold), which I try to place in the middle of zone 4. Seems more practical.
I set mine by breathing. Seems to me that the top of Z4 should be just below where one starts to pant when gradually increasing intensity on a long climb. I take it up to panting, then back off to holding fast belly breathing and have a look at heart and power readings.