Is it plausible on the newest Garmin watches they silently track Aerobic Threshold in the Firstbeat ecosystem?
The advanced historical projected LTHR is new since Fenix7/Fenix8 since the Fenix6 Firstbeat doesn't do that
Which makes me wonder if buried particularly in Run activities they are silently tracking Aerobic Threshold
It cannot be done from a single run, it would have to be over several activity/weeks, so it would have to be forwarded in each FIT file
Just to clarify, LTHR is actually anaerobic threshold (aka Ventilatory Threshold 2)
Aerobic Threshold is sometimes rarely called "fatmax" or Ventilatory Threshold 1 aka AeT
AeT is typically half of vo2max but not always depending on training/genetics
I'm kinda surprised Garmin doesn't openly expose/track Aerobic Threshold as of 2026, they've practically exhausted every other metric in Firstbeat
But it basically MUST silently do it since you are given an Aerobic+Anaerobic score for each Run