@VoiGAS You may be right. Eduardo (who runs a marathon) provides information in his analysis about a “recent” test, nothing about it having been performed in November. It’s perfectly clear that Ray is the third person to take the same test, and that’s why we can draw any conclusions.
A few days later, Eduardo released a video with “clarifications” about possible confusions in the previous video.
https://www.youtube.com/live/003mEjs_j9Y?si=X-sc-sqqAUCGjAC0
Waiting for possible reactions or Ray’s knowledge of his personal analysis… in short, as far as my use of ZS is concerned, it is a tool more focused on RESISTANCE, ULTRAS… and above all, very personal for controlling your RPE with your device…