I’ve recently been doing Cusick’s FTP progression he outlines in his fatigue resistance slide deck that’s floating around on the forum in a couple threads.
Basically 3x10 > 3x15 > 5x10 > 2x25 > 6x10 > 3x20 > 1x60
I’ve been doing them on Tues/Sat and the other days have been roughly 2hr Z2 rides. I made it through the progress to 3x20 this past Saturday. Yesterday I knew there was no way I was going to be able to do 60 mins at FTP, so I tried a 30/20/10 at FTP. Made it through the 30 min interval JUST BARELY, then only 10 mins of the 20 min interval. After that I was SMOKED. My legs are definitely trashed, but up to this point I’ve been accumulating fatigue for sure in my legs, but not so much that I couldn’t do the next workout in the progression.