High-Intensity Interval Training (HIIT) often dominates fitness headlines, but exercise physiologists and longevity physicians increasingly emphasize the foundational importance of Zone 2 steady-state cardiovascular training.
Mitochondrial Health and Metabolic Flexibility
Spending 150-180 minutes per week in Zone 2 significantly increases mitochondrial density and functional efficiency in type I slow-twitch muscle fibers, enhancing total cardiovascular output.