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Kickboxing, also referred to as boxing aerobics and cardio kickboxing is a hybrid of boxing, martial arts and aerobics that offers an intense cross-training and total body workout. Some estimates of kickboxing's calorie burning potential have reached as high as 500 to 800 calories per hour, but ACE-sponsored research suggests that only very large individuals working out at exceptionally high intensities are likely to burn that many calories.