Combine cardio with core work to reap the flat-belly benefits of both types of sweat sessions in this quick, 20-minute workout. It alternates between jumping rope and standing ab exercise, so you can tone your belly while burning serious calories in just 20 minutes. We use one eight-pound dumbbell in this workout to increase the toning potential of each exercise. No weights? No problem. This workout will still be effective without them.
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