Can a tiny amount of high-intensity exercise per day or per week – and here we are talking about just a few minutes a day – have big health benefits? This is the promise of HIIT, or High Intensity Interval Training. The idea is that HIIT can boost the health of your cells’ mitochondria. It also has to do with improving V02 Max (the maximum oxygen capacity for your body), the measure of your high intensity fitness.

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