Many first-time attempts result in substitution patterns – holding the breath, pressing the abdominals outward, or contracting the rectus abdominis (six-pack muscle) instead.

Rectus abdominis. The rectus abdominus muscle is the muscle people are usually referring to when they mention “ abs .” This is the muscle that forms a “six-pack” at the front of your core.

Located directly behind your rectus abdominis (i.e., “abs”), the transversus abdominis wraps horizontally around your lower abdomen like a girdle or weight belt, hugging your internal organs ...

So while, yes, the rectus abdominis (the front-facing ab muscles) is a large part of the core, it’s not the only muscle group that we should think about and train.

Ditch planks for a 6-minute Pilates core finisher that targets deep muscles fast, boosts stability, and enhances posture.

Discover the most effective exercises for achieving a flat stomach through proper core training, cardio balance, and full-body movements that burn fat ...

A trainer and swim coach breaks down 10 of his top-recommended swimming exercises for your abs and a stronger core.

For Haffer, the six-pack quest reflects a misconception that a visible rectus abdominis is indicative of a strong core and lower back. “The abs are core, but they aren’t true core,” Haffer said.

Reverse crunches target the lower abs and tone the lower belly pooch by working the rectus abdominis, ... They also work the transverse abdominis, a deep core muscle that is essential for core ...

Diastasis recti is the separation of the rectus abdominis muscles, commonly known as the "six-pack" muscles, ... and diaphragm), and focus on controlled muscle engagement. ...

Why do I still look pregnant? That post-baby belly pooch may be diastasis recti, and how to remove it may surprise you. Find out at WebMD.