You mention LT1 and its actual vs approximate measurement.
In an July 21 post:
Learning to recognise physical sensations associated with different levels of power
I posted my application of the Talk Test using the alphabet or mobile number as a test for approximate identification of the VT1 and VT2 borderlines, as useful measures for Polarised Training zones, ie, 80% below VT1, and up to 20% above VT2, not much at all between.
Not implying this measurement approach as being perfect, rather practical. Power tools are mere algorithmic estimators. Absolute FTP isn’t particularly important, whereas its progress for an individual over a training plan can be very useful.
Have you any experience of this Talk Test application to Polarised training zones?