HIIT Republic deliver High Intensity Interval Training (HIIT) workouts that mix together cardio, conditioning and plyometric (jumping) exercises all in one fun class! No need to spend hours in the gym. The principle of High Intensity Interval Training is to perform repeated short bursts of intense exercise followed by short recovery periods. On average, our members burn over 500 calories during a 30 minute class. However, because of the high intensity exercise the result is that you will continue to burn calories even after you finish exercising. A study at Colorado State University found just 150 seconds of intense exercise can burn as many as 200 calories over the course of the next 24 hours thanks to a boosted resting metabolic rate.