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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.
Absolutely fabulous! Abs of steel for summer. The abdominal muscles are the four big ones that shape the outer appearance of your stomach. > the rectus abdominis links the trunk to your lower limbs. This is the muscle we work through traditional stomach exercises. A well-defined rectus abdominis is also known as a six-pack!