HIIT stands for High-Intensity Interval Training It is the #1 Hormetic Biohack for Mitochondria, Fat Loss, and Longevity 1. HIIT in 1 Sentence HIIT = alternating bursts of near-max effort (80–95% HRmax) with short recovery periods — the fastest way to upgrade your mitochondria, burn fat, and extend lifespan. 2. HIIT vs. Steady-State Cardio Metric […]