Source: American Council on Exercise
Let’s talk about your abs. Six-pack abs are the result of the presence of muscle combined with an absence of fat. What many people don’t realize is that visible abdominal muscles are more the product of what happens in the kitchen and at meals versus what happens in the gym.
The rectus abdominis (the anatomical designation of the six-pack area) is crisscrossed by connective tissue, so your torso can move in different directions. This crisscross is responsible for the corrugated rippled look, and without it, the midsection would be difficult to bend, extend and twist.
When a well-established diet-and-exercise strategy for fat loss is followed, the amount of fat between the crisscrossed abdominal muscles and the skin decreases until the skin is sitting right on top of this crisscross. This is how six-pack abs are revealed.