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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.
Weight Training. Here's the heads up on the abdominal muscles: what they are, where they are, how to train them, which exercises work best. The Abdominals Muscles: Three Main Groups. The 'abs' are the groups of muscles in the abdomen or the stomach area -- generally below the rib cage toward the pelvis and at the sides. The three main groups and their function are: Rectus abdominis (RA) The RA flexes the lumbar spine and tilts the pelvis and helps maintain the curvature of the lower spine.