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If you're looking for a way to strengthen your abdominal muscles, try crunches. They're a lot like sit-ups, but instead of lifting your entire back off the floor, you only lift your upper back. This isolates ("crunches") the abdominal muscles without engaging muscles in your hips. Once you learn to do basic crunches, you can also try reverse crunches, twist crunches, side crunches, and cable crunches.