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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.
By strengthening core muscles you will not only be on a fast track to a flatter stomach but will also improve the effectiveness of any exercise you do. The plank is one of the best exercises because it tightens the deepest core muscles. Itâs a static exercise where you use your arms to raise yourself off the floor and hold the whole body straight and rigid, like a plank of wood.