HIIT

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. The times vary, based on a participant's current fitness level.[1] Furthermore, traditional HIIT was designed to be no longer than 20 seconds on with no more than 10 seconds off. This would bring in the anaerobic energy system. The intensity of HIIT also depends on the duration of the session.