07/30/2026
Although Zone 2 has become trendy shoptalk for burning fat, applying it in a holistic way has a plethora of proven benefits for our body systems. Firstly, reaching Zone 2 cardio in a consistent manner helps to build mitochondria (the energy-producing engines inside of every cell.) The stimulation of mitochondrial biogenesis results in energy production (ATP), improved fat metabolization, and a stronger and more resilient heart and vascular system as you age. Essentially, an influx of healthier mitochondria results in more endurance and tenacity in the basic foundation of our bodies.
Along with improving mitochondrial function, Zone 2 strengthens the heart muscle to pump more blood with each beat. Over time, this lowers resting heart rate and improves circulation. It also increases the number of capillaries (small blood vessels) around muscles to improve blood flow and boost red blood cell production to deliver more oxygen to muscles.
The big catch in today’s discourse is that Zone 2 enhances fat oxidation. In this gear, your body relies mostly on fat for fuel. The higher your heart rate soars (to a higher Zone) the more your body uses sources other than fat like carbohydrates (glycogen) and protein for fuel. Higher zones also result in less oxygen intake, which further restricts the body from being able to burn fat. Exercising in Zone 2 gives priority to fat-burning and does not push your body to a point where it needs to rely on those other fuel resources.
