HIIT is a form of cardio that involves short intervals of maximum intensity exercise separated by longer intervals of low to moderate intensity exercise. Because it involves briefly pushing yourself beyond the upper end of your aerobic exercise zone, it offers you several advantages that traditional steady-state exercise (where you keep your heart rate within your aerobic zone) can’t provide: For example, for running, you can perform 60 seconds of running at a moderate speed, then 60 seconds of running at your maximum speed, then 60 seconds of walking.
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