Zone 2 Cardio Training became the preferred cardio protocol among biohackers in 2025, popularized by Peter Attia. It targets 60-70% max heart rate to build mitochondrial density, and heart rate monitor sales surged 55%. This method is 30% lighter on the joints than high-intensity interval training, and outperforms #5 Sleep Optimization in metabolic efficiency gains, reducing HbA1c by 0.5% in 12 weeks. Data shows a 20% increase in fat oxidation during sessions, cementing its role in longevity routines.
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