VO2 max testing, zone 2 training, HIIT overtraining, longevity metrics, heart rate training, submax testing, fitness assessment, aerobic capacity, metabolic efficiency, training zones. Fitness expert reveals why VO2 max became the “hot topic” in longevity and why most people are training Zone 2 incorrectly. Discover the shift from athlete-only testing to mainstream fitness and how HIIT obsession is sabotaging your results.
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