The point I read is that if zone 2 feels easy then you likely should focus on a system to improve your aerobic base. Assuming your goal is to get faster. If zone 2 feels hard and you are producing a decent amount of watts in zone 2 then you can spent more time focusing on other aspects of training. I can’t exactly explain how I see this but the concept seems important to me.
These two things are simultaneously true.
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I am one of the many cyclists who would benefit significantly from working to improve their aerobic fitness. In this context, to make my Zone 2 harder.
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Following a “complete” training cycle (here I will use base - FTP - VO2 - Anaerobic to describe that) is an effective way of improving my cycling fitness and improving my performance in the type of cycling I expect to do in the coming months.
Even though I know that I have a lot of room to grow my aerobic fitness, that doesn’t mean that I shouldn’t do FTP - VO2 - anaerobic.
Indeed, such work will be beneficial.
I accept that the results of higher intensity training would be better if I had better aerobic fitness.
With that in mind, once I have spent some time working on FTP - VO2 - Anaerobic, I will go back to mostly working on my aerobic fitness.
Later, I will do a bit more higher intensity stuff.
And so on.