for example when you have an FTP of 200w endurance training must between 112W and 150W max.
The workouts in zwift says endurance @ 145W.
So when you have an external powermeter its very easy to shoot 10w over or onder on erg
What i do is i correct my bias from 145W to 130W makes al my power lays between 120W and 145W.
Much more in line with my hf also in endurance zone than.
I do the same for al the other zones.