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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.
Generally, human stomachs have a volume about one liter, which is a little more than one quart. Since the stomach has the ability to expand, it can hold much more food.The human stomach can be distended up to four liters, which is more than one gallon. Imagine your stomach to be an empty one-gallon milk carton.There is plenty room for food!hese muscles expand and contract depending on how much food is in the stomach. This contraction is a form of mechanical breakdown of the food. The purpose of this breakdown is to increase the available surface area for the chemicals to act on it.