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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.
What is an advantage of folds in the stomach and in the intestines?   In the stomach, the folds (rugae) are there so that the stomach can expand under the influence of parasympathetic stimulation and stretching by the ingestion of food. Thâ¦is process is known as accommodation.