I know an amazing one.. P90X, it's very difficult if you're looking for something like that but it's extremely effective. This isn't something for people who aren't willing to work hard though.
It will work. The problem is people quit it early or don't do it everyday. It is important that you commit to it as long as it says, and that you dont ease up when you get tired. If you don't give your all, you will not see results that you like. The reason that the people who go and have an actual session get better results is because they have someone pushing them. Don't give up!!