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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.
At either end of the esophagus are ring-shaped muscles (the upper and lower esophageal sphincters), which open and close. The esophageal sphincters normally prevent the contents of the stomach from flowing back into the esophagus or throat. NOTE: This is the Consumer Version.