High Intensity Interval Training

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High-intensity interval training (HIIT) is a form of interval training, a cardiovascular exercise strategy alternating short periods of intense anaerobic exercise with less intense recovery periods, until too exhausted to continue. The method is not just restricted to cardio and frequently includes weights for the short periods as well. Though there is no universal HIIT session duration, these intense workouts typically last under 30 minutes as it uses the anaerobic energy systems which are typically used for short, sharp bursts.