The tide turns on vo2max?

You should read Peter Seiler’s studies on polarized training, totally changed my approach. It’s much simpler with 3 zones - 80-90% ZOne 1 and 10-20% of Zone 3, that’s it. I pretty much count all my gym, yoga, slow runs/cycling as zone 1 - 9 hours and over AnT for about 1 hour.

I don’t actually do any structured training especially with HIIT, I gamify it by using Strava segments.