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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.
Stand and Stretch Those Abs. To stretch the abdominal muscles, try the standing abdominal stretch. Stand straight, feet about shoulder-width apart, your arms extended above your head. Slowly arch your back, moving your arms back at the same time so your fingers pointing away from you behind your head.