Experienced athletes need to get away from two ideas that speak to the topic you’ve inquired about, concepts keeping you slower than you could be and never coming close to your true potential…
The first and most important idea that we as runners and endurance athletes as a whole hold on to this idea that one’s vo2max, and thus the maximal aerobic capacity of one’s aerobic engine, is genetically determined and can only be improved in the short term. The idea is that one will see a quick jump in their vo2 max during the “newbie gains” phase of one’s athletic development, and then you’ve reached your genetic ceiling with respect to vo2 max, which again would be the maximal aerobic capacity of your engine.
This idea of a “genetically fixed” vo2 max has become the general consensus in spite of it being a misrepresentation of what’s actually possible, (a hint, it can be developed long term). As a result of this misunderstanding, the training paradigms that are the norm will NOT focus on what is the key lever to improve all other physiological variables that impact performance in any endurance sport: vo2 max or said another way the aerobic capacity of one’s engine. Instead, training will focus on the levers that can improve performance in the short term but are ultimately limited by ones maximal aerobic capacity. This would be things like threshold/FTP/critical velocity, anaerobic abilities, running economy, etc…
To borrow an analogy, your vo2 max is the ceiling and let’s call the other big time driver of performance, threshold/FTP, the floor. It’s the “height” of the floor that is a better predictor of one’s race day performance BUT that doesn’t mean it’s the most important lever to train for long term progression. The floor can only be raised as high as one’s ceiling will allow; one can’t keep raising the floor (threshold) long term unless one raises the ceiling nor can it “push up” the ceiling. Conversely, raising the ceiling (aerobic capacity) can “pull” the floor up and/or make room for more one to keep pushing up the floor, (threshold).
Still, since we have this fixed and genetically determined mindset about vo2 max and the capacity of the aerobic engine, we focus our training on these physiological variables that can only improve as much as one’s aerobic capacity will allow. This leads to the second idea that a runner aspiring to continue to develop as an endurance athlete long term needs to get away from following and learn a different approach…
Since one embraces this misconception that they can not continue to develop their aerobic cavity long term, the focus instead gets shifted to training the their physiology that is ultimately constrained by their aerobic capacity. So what ultimately ends up happening is that the advanced athlete eventually ends up in this cycle of taking day their threshold to its absolute limit relative to one’s capacity and on the knifes edge of breaking down. This is the “macro cycle” where you are “peaking” for a key race and then “recovering” with the “necessary” time off after pushing their threshold to its absolute limit. This ultimately results in long term stagnation at best.
My view is that this would be quite different if we were to understand that one’s vo2 max can be developed long term, (great article from exercise physiologist Alan couzens showing evidence this is not only possible but normal with the proper training focused on long term development - https://simplifaster.com/articles/how-trainable-is-vo2-max/). If one could see that it’s possible to continue to progress the aerobic capacity long term then that would be the focus for their training 90% of the year. One would worry less about periodization schemes, peaking, taking time off, etc… and instead adopt a similar attitude to what Canova is saying and always look to add, not subtract. One would not give up their heard earned fitness with long periods of time off, and it wouldn’t feel necessary because the training was always progressive within the abilities of the athlete to recover. The recovery was “baked-in” already week in, week out.