another easy interpretation is simply 85% zone 2, 15% everything else....this is called polarized training and what and how alot of the pro tour cyclists approach training.
The thing is..... you won't really get the maximal benefits of that 15% until you build a really solid zone 2 aerobic base...
I've found what worked wonders for me were a combo of the following: heavy (for me) rucks: 60-80lbs usually between 3-5 miles twice a week. 1 or 2, 2hr + zone 2 flat bike rides. then 2 heavy squat sessions a week.
This kinda thing year round made mountain time totally a cinch
As a semi-serious road cyclist and competitor.....someone who's utilized super structured training plans.... base seasons, build phases, peaking. etc etc.. All i know is that nothing seriously compares to long Z2 training sessions. (2 hr+ are ideal) 3 hr+ rides with consistent RPM is magical...