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Zone 2 Endurance

Meaning

A specific, moderate physiological state of exercise intensity where the overwhelming majority of the body’s energy production is efficiently derived from the oxidation of fatty acids, typically corresponding to approximately 60-70% of an individual’s measured maximum heart rate. Clinically, training consistently within this zone is utilized to significantly enhance mitochondrial efficiency, improve systemic metabolic flexibility, and build a robust, resilient aerobic base for long-term health and sustained physical performance. Optimal Zone 2 endurance is a strong, quantifiable indicator of cardiovascular fitness and efficient energy metabolism, directly correlating with longevity and metabolic health markers.