Hi, I’m John and I’m new here. Currently reading 80/20 and I’m stoked about it. I’ve read pretty much every running book over the past 35 years, and this one has resonated with me a bunch. Thanks, Matt, for putting it together.
My question is about HR zones. I’ve set mine up according to the book. However, in now discovering the website (and calculator), I’m seeing differing numbers. Which do you suggest I follow? The book or the website?
For instance, the book has Z1 as 75-80% of LTHR. Z2 is 81-89%. The website has Z1 as 72-81% and Z2 as 81-90%. Understanding that these differences are fairly minor, but I’m curious if the website contains the most recent information.
Thanks in advance!
John