HIIT or High Intensity Interval Training is a type of interval training exercise. It incorporates several rounds that alternate between bursts of high intensity movements to significantly increase the heart rate to at least 80% of one's maximum heart rate, followed by short periods of rest or lower intensity movements. This class is popular with athletes as it provides fast and effective results, increasing lactic acid threshold, increasing overall fitness and one’s ability to recover. It is great class to lose weight, shape and tone the body as well as improve your cardiovascular fitness.