Zone 2 training intensity can be underestimated if relying solely on wattage without considering heart rate and lactate.

“understanding where my zone 2 is on any given day is a function of my power in other words how much power am i putting out on the bike my heart rate how i feel how rested i am um where i am physiologically in my stress cycle so am i over trained or under trained uh frankly even my glucose level tends to play a role”