I have been doing Callanetics on and off for the past 5 years! I love it! I think I'm going to get back into again too, it's so amazing what it does for your body. I am a strong mesomorph type and want to lean out my bulky existing muscles, this does the trick! But the key is to remain consistant and try to do all the exercises correctly. It takes time, but in a few short weeks you will master them.