Whats the actual scientific basis for the widespread emphasis on Zone 2 training for aerobic energy system efficiency, and are there any studies that have demonstrated a clear, quantifiable benefit to focusing on this specific intensity zone for endurance athletes.
It seems like every coach and training plan is pushing Zone 2 as the holy grail of aerobic development, but when you dig into the research, its surprisingly thin on concrete evidence. Is it possible that were just following a trend here, and that other intensity zones or training protocols could be just as effective, if not more so.
Furthermore, how do we account for individual variability in aerobic response to different intensity zones. If everyones physiology is unique, then why are we applying a one-size-fits-all approach to Zone 2 training. Shouldnt we be looking at more personalized, data-driven approaches to optimizing aerobic efficiency.
Lastly, whats the relationship between Zone 2 training and actual racing performance. Are we just assuming that improvements in aerobic efficiency will automatically translate to better results on the road, or is there actual data to support this claim.