Originally Posted by
Turnin_Wrenches
There is nothing inherently fatiguing about Z3. Large doses of anything without sufficient recovery will increase fatigue and hinder training.
I think that’s right. Every ride induces some amount of fatigue, which ought to be reflected in its TSS number, a function of intensity and duration. I watch my weekly TSS to make sure I don’t increase it too quickly.
Two hours of tempo (zone 3), twice per week, is what I’m doing currently for my “hard days”. Is that more fatiguing than 1 hour of zone 4, twice per week?