I have been slowly working through a TftNA plan over the last 12 months to assist in a mostly flat 100 mile ruck march in Holland (Nijmegen March), which I successfully completed a couple of weeks ago. My next goal is Rainier about 10 months from now, and I have purchased the time crunched plan due to my limited training time and flat home topography.
I note that the first task in the plan is to calculate the AnT which I have read in the forum as corresponding to the top of Z3. The aerobic workouts in the plan seem to focus on the upper limits of the AnT 80-90%, which would correspond to upper Z2 to mid Z3 for the aerobically challenged like me with large zones. My TftNA plans were almost exclusively focused on Z1 training (below AeT) to help build a strong aerobic base, and I expected more Z1 training in my future. You mention above the AeT is the focus of 90% of the base training.
Is the focus of the aerobic training in the time crunched plan being close to the AnT as opposed to the AeT due to the more limited training hours in the plan? 6hrs/week versus 10+ for the longer plans? I know you mentioned going harder is not a shortcut to building aerobic capacity. Unless I’m reading something wrong in the plan, my concern that that I will be ignoring the low and slow Z1 workouts for 12 weeks, and working mostly in Z3. Thanks for any clarification you can provide.