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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.
SHARE SHARE TWEET EMAIL. The muscles that play the primary role in moving a body part are formally known as agonist muscles and are often referred to as prime movers. Although they are categorized as prime movers for their contracting action, the same muscles can also extend. These major muscles include the pectoralis major, deltoid, latissimus dorsi, gluteus maximus and quadriceps.