Can we all just agree that a significant portion of the science behind training zones is nothing more than a numbers game, and even the most precise calculations are rendered useless by the massive genetic variability that exists between athletes - I mean, how can we expect a one-size-fits-all approach to Zone 2 training to be effective when some people are naturally gifted with a higher mitochondrial density, a more efficient aerobic energy system, or a lower lactate threshold.
And yet, we still see coaches and training programs insisting on a strict adherence to the 50-60% of threshold power for Zone 2, without ever accounting for the fact that some athletes might be able to sustain a much higher intensity without actually entering Zone 3 or 4 - is it really that hard to understand that a rider with a naturally high VO2max is going to respond differently to Zone 2 training than someone who has to work twice as hard just to get their heart rate up.
So, can we please have a real discussion about how to adapt Zone 2 training to individual genetic profiles, rather than just regurgitating the same tired dogma about keeping it aerobic and building endurance - I mean, come on, we all know thats just a euphemism for I dont actually know what Im doing, so just follow this generic plan and hope for the best.