Zone 2 Cardio for Mitochondrial Health

Zone 2: The Foundation of Endurance

Zone 2 training refers to exercising at a low, sustainable intensity—typically described as an effort where you can still hold a conversation. While it doesn't feel hard, this type of training is the foundation for metabolic health and endurance. It specifically trains your mitochondria to become more efficient at using fat as a fuel source. A large volume of Zone 2 training builds a robust aerobic base, which is critical for overall healthspan. It improves mitochondrial density and function, which is a key factor in combating age-related energy decline. Longevity experts often recommend that the majority of an individual's weekly cardio (e.g., 80%) should be in this Zone 2 range.