What Muscles Make Up a Sixpack?

While the transverse abdominis (TA) is the deepest muscle in the abdominal region, it helps to stabilize and compress the abdomen. The rectus abdominis, on the other hand, is the most superficial of the six-pack muscles, and its function is to flex the spine. 

The rectus abdominis is the outermost muscle in the abdominal region, and is separated from the other three by a white line. This muscle is a crucial postural muscle, helping you breathe properly and stabilizing your torso during exercise. It also protects the organs from impact. This muscle is the foundation of a six-pack. Luckily, there are a few exercises that can build and define your core and give you that coveted “six-pack.”

The rectus abdominis is the deepest abdominal muscle. This muscle lies on top of the rectus abdominis, and is surrounded by large bands of tendons. Unfortunately, body fat around the belly area reduces the strength of this muscle, resulting in a flat-abs look. For this reason, it is important to maintain a low percentage of abdominal fat and maintain an erect posture.

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