I'm really surprised and disappointed that so many people gave this video high marks, especially since I bought the video based on those reviews. I rarely contribute comments on videos, but after doing this video for the first time today I was so disappointed I have to comment. It is a great instructional video for the beginner who has never done a kickboxing workout before. But if you are looking for a cardio workout, this is not it. Kathy takes so much time to teach and build up all the components of a move. Then when you finally do the complete move, the number of reps are very low, and you are back to training for the next move. I barely broke a sweat. If you are looking for a great cardio kickboxing workout, buy Power Kicks (Aaron Langford). I'm desperately searching for another great kickboxing video to have some variety, but with Kathy's video I'm disappointed yet again.