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HIIT (High Intensity Interval Training) is perfect for people who like to keep fit and active, but whose schedules may be too busy to commit to a regular gym routine. The beauty of HIIT is that the workouts are short and effective, although the punishing nature of the workouts is something for which you should be prepared. Such is the intensity of HIIT that even professional athletes will be exhausted after it, but that’s a good sign as it means the workout has probably been done correctly and will have the desired effect.
Source: http://www.myfitnessboutique.co.uk/description/hiit-classes.html
