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Abs on the Ball: A Pilates Approach to Building Superb Abdominals Best Price: $5.75 In this text, Colleen Craig brings a new set of core strength exercises using inflatable balls.... | Pilates on the Ball | Abs on the Ball: A Pilates Approach to Building Superb Abdominals Best Price: $5.75 In this text, Colleen Craig brings a new set of core strength exercises using inflatable balls.... | Pilates on the Ball | |