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If you're training other muscles and you think you're exercising your core, you're training the wrong muscles. The 5 true core muscles are the only ones that really matter when it comes to training your abs for a flat stomach.
1 Skeletal muscle moves the external body parts, like the arms and legs, neck, back, trunk, and the face. 2  Smooth muscle moves portions of hollow structures inside the body. 3  Examples include the muscles that line the esophagus, stomach, and intestines, muscles that line large arteries, and the muscles of the uterus.