Kickboxing & Boxing for non-contact fitness training is the king of cardio. Cardiovascular training is all about reaching the "steady state" of calorie burn which is about 60-70% of your max heart rate & holding pace. 

We compile our CARDIO sessions with non-stop, high repetition strike training & weights training. This avoids the "bulky" look because your body's energy systems are generally operating in an aerobic state instead an-aerobic.