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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.
The distal esophagus is the end of the esophagus by the stomach, notes Medscape. It is primarily smooth muscle, just like the gastrointestinal tract, while the proximal esophagus by the throat is striated muscle. The central section transitions from striated to smooth muscle. The muscle layers perform peristalsis, pushing food to the stomach.