HIIT (High Intensity Interval Training) is cardio performed at such an intense level that your body will spend the rest of the day expending energy to recover from the ass-kicking you gave it. This is commonly referred to as EPOC (excess post-exercise oxygen consumption) and it means that you consume a great deal more oxygen recovering from the exercise bout than you would have if you’d just done a steady-state workout.

This means that you will be burning up to nine times more fat while sitting on the couch later that night than you would have if you’d spent an hour on the treadmill at a moderate pace.

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