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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 short answer to the question, what muscles do push ups work is that they work the muscles of your upper torso. This is a simplification however. The muscles of your upper torso include the following: 1  Pectoral muscles (pectoralis major and pectoralis minor).he short answer to the question, what muscles do push ups work is that they work the muscles of your upper torso. This is a simplification however. The muscles of your upper torso include the following: 1  Pectoral muscles (pectoralis major and pectoralis minor).