@beastofmisery:

Training at XXX% of FTP does NOT necessarily mean you’re training VO2max. Training at YY% of HR does NOT necessarily mean you’re training VO2max. Using “VO2max” to describe power or HR zones is a mistake, but we’ve done it… You train VO2max by getting to maximal O2 uptake and staying there. That’s generally done by achieving the hardest breathing you’ve ever done in your life and sustaining that for as