Hello!
Welcome to VF and thanks for posting! The green genie balls are small, squishy balls that weigh about 3 pounds. Medicine balls are firmer and larger, and they are available in a wide range of weights. If you are looking to start out, I would recommend a 4 pound medicine ball. You can use it for many workouts, from Cathe to the Firm to CIA. I do like the green genies for some of Karen V's workouts, and also have used it for the Firm at times; they are easy to grip in one hand, and feel kind of nice. You can substitute a dumbbell for several exercises where a medicine ball is used, but there are some exercises where a dumbbell would not be a good substitute, particularly with certain abdominal exercises and during cardio with arm movements holding the ball. There is also something about the weight distribution and shape of the ball versus the dumbbell that makes it easier and more enjoyable to use. Hope that helps.
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