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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.
Your oblique muscles (side abdominals) help you to bend from the side or twist your torso. Strong obliques support the lower back, warding off back pain and posture problems.he abs include the Rectus abdominis, the Transversus abdominis, and a pair of muscles called the obliques. The oblique muscles actually include the following pair of muscles on each of your sides: 1  The external obliques form the top muscle. 2  The internal obliques lie underneath the external obliques.