Originally Posted by
GhostRider62
ISM on the other hand gives more specific advice albeit along the same vein.
Looked up ISM and now, in an elementary way, have my head around threshold and how Z2 training works for improving lactate clearing. I'm close to the 90/10 split at 10-12 hrs per week, but now I see the importance of completing the week's long all-Z2 ride.
https://www.trainingpeaks.com/blog/w...ate-threshold/
by Iñigo San Millán