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We know how important core work is for preventing injury, but sit-ups and other ab exercises can be so hard on the back. This is why we're glad to bring you this workout kit. It includes a unique peanut-shaped ab ball that supports the lower back, as well as a workout DVD that teaches correct posture and form so you can avoid strain and soreness. And because it includes a bonus downloadable workout, you can keep progressing in your daily routine!