Enduro makes no sense to me. It is aimed at very hard, and short duration efforts. As such, it uses the Short Power Build and Gravity Specialty which are more about high power, short duration.
For loading riding at what I expect to be lower than threshold efforts, I would think you want Sustained Power Build and something like the Century Specialty. Maybe even Climbing Road Race Specialty since it is still steady-ish effort with some kicks, that may be beneficial for some pitches while loaded.
But for a ride/race of that distance, I think your focus should be on longer, steadier power.
Awesome Chad. Thank you as always. I’ve just finished the first block of Enduro and have a light week. Next week is an ftp test. Should I start over with a fresh plan? Or just change the next block in AT?
Did you apply your training plan using Plan Builder, or manually adding blocks?
If you used Plan Builder, you can alter upcoming training blocks to different versions. You find the starting annotation for any block on your calendar (usually at the same day as first workout of the week on that block), and open it. At the top, you can alter the actual plan phase to any you want as well as the volume.
So, the choice is up to you. If your plan already covers the right timing, you can likely just manually override the specific plan to whatever you want.