Gym machines help target and build specific muscle groups, making them great for ab exercise. Moves like the Pallof press, leg raise, and cable crunch work all the muscles of your core. Exercise like ...

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You don't need to do thousands of sit-ups or spend hours in the gym to build abs. You can instead do the bare minimum of two to three ab-focused exercises for 20 to 30 minutes a week. Exercises like ...