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What Is Zone 2 Cardio?
Zone two cardio refers to a specific range of physiological stressors just before metabolic shifts occur, indicating progression into higher intensity zones. It is not solely about heart rate percentage but rather the period before the body surpasses its first ventilatory threshold. This threshold is marked by the accumulation of metabolites, changes in blood pH, and altered lactate levels. Cardiovascular training zones can be seen as inflection points where the body advances to higher energy generation levels.