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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.
Crunches chiefly serve to tone, define and strengthen the abdominal -- or âcoreâ -- muscles. As such, this exercise squarely targets the rectus abdominis -- the two parallel muscles that run down the abdomen -- and the transverse abdominis, an inner layer of stomach muscles that help stabilize the spine. Crunches also engage the obliques, the muscles that run down the sides of the torso, as synergists.