Great thread, I also struggled with this. I ended up creating custom zones in TP named after the TFtNA convention (I think there is some inconsistency even in TFtNA: sometimes AeT is called upper end if Z1, sometimes upper end of Z2)
For my AeT 140 and AnT 167 I went for
Zone 1: Basic Endurance 128-140
Zone 2: No Man’s Land 141-152
Zone 3: Uppermost Aerobic 153-167
And a few more I dont want to be in while training 😉
I also use a Garmin fenix HR watch where I configured the same zones (it only supports Z1-Z5 system). In practice for my workouts at or just below AeT the watch thinks I’m in the “resting” zone, but thats just cosmetic.
Anyway, I found only 2 points matter: AeT and AnT. During endurance training I am trying to stay at just below one of these two numbers.
I like Scott’s suggestion that in the next book (exciting!!!) this will be the basis of the zone model.
Btw: it would be nice to have an official FAQ on setting up TP zones for TFtNA on the website. And what would even better would be if TP let me select “TFtNA Zones” from their list of Zone systems. With so many copies sold (congrats!) I would think TP might be willing to do it?
Another random TP tip: I do my AeT and AnT workouts on a 15% treadmill and use the Indoor Running garmin activity. After each workout is done, I then set TP to use hrTSS instead of rTSS (only possible on website not app). I wish I could default that somehow, or that TP could be configured with the incline so the rTSS model would be more accurate.
Chris
