I also have the "Core Secrets" dvd for my ball. It's the Give Me 20/Fundamentaals cd which is 20 minutes each, but it shows you basic moves that you can build on and works a variety of major muscles. It's not incredibly challenging.. granted I couldn't keep up or do some of the moves, but hey, I'm a beginner and 300+ pounds! I got the ball and the workout off Ebay.
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