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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.
Some examples of smooth muscles are the ones in our digestive system, that relax and tighten to control the movement of food through our body. Another example is the muscles in our bladder that (when relaxed) allow storage of urine and (when contracted) push the urine out of our body.