If you haven't practiced before, you may not be able to stick to the first jump (Kitty's exercise is still quite large for the average person). You can add more slowly, but you must stick to it and practice every day. Also, if you buy a disc to practice at home (like me), you must do it well, otherwise the effect will be discounted!
If you practice, you can lose 10 A Jin month. I lost 20 pounds in half a month because I was dieting when I was practicing.