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How to start an ab workout
Start with butterfly crunches.
This is a simple yet effective move that targets the rectus abdominis-the 6-pack area-and is great for beginners.
Lie on your back with the soles of your feet together as close to your body as possible, with knees bent out to sides.
Place your hands beside your ears to keep yourself from yanking on your neck. Keeping your back flat on the floor and stomach muscles contracted, exhale and curl your chest up a few inches off the floor toward your legs.