The rectus sheath is made up of two parts, known as the posterior sheath and the anterior sheath. These sheaths are made of fibers of the transversus abdominis, internal abdominal oblique (IAO), and ...

While the visible upper layer, the rectus abdominis, is needed for the sexy, ‘six-pack’ look, the other two layers, hidden underneath the rectus, are often involved in quite complex ‘core exercises’ ...

“Why is the abdominal region the most popular and sought after in terms of perfection for women?” asks a journalist in her email to me. A quick look at some of the most recent magazine covers verifies ...