I just got Ab Jam which is part of Turbo Jam, it has 10 minutes of standing core work and 10 minutes of floor work, it is fun and I can feel my abs working. It sure is the most fun core workout I have ever done, and I have purchase a lot of workouts including pilates. This is fun, and BTW Turbo Jam works your core also while burning calories.
check it out at: TurboJam.com
check it out at: TurboJam.com