"Like many forms of exercise, high-intensity interval training [HIIT] can elicit improvements in cardiorespiratory fitness, which is an important marker of longevity and risk for developing many chronic diseases," says Martin Gibala, Ph.D., a professor of kinesiology at McMaster University in Hamilton, Ontario. "HIIT can also improve metabolic fitness, which reflects the capacity to oxidize or 'burn' fuels like sugars and fats to produce cellular energy, and in turn is linked to blood markers of health such as insulin sensitivity."
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