While most people are familiar with their rectus abdominis — also known as the “six pack” abs — many forget about or are unaware of a deeper abdominal muscle called the transversus abdominis.

Some part of your abs workouts should be spent targeting the transversus abdominis, a core muscle that stabilizes the spine to make your six-pack stronger.

Transverse abdominis. The transverse abdominis is the deepest muscle layer. It is a sheet-like muscle that runs from the rib ...

The transverse abdominis is among the most powerful muscles in your deep core. This hidden abdominal muscle is essential for maintaining posture and reducing injury risk, but it may not be engaged ...

Strong transverse abdominis muscles also play an important role in keeping your back safe when you perform big, compound-move lifts during your workout, like deadlifts or squats, Baltimore-based ...

Also known as the obliquus externus abdominis, this muscle arises from the lower eight ribs and attaches to the hip bone. ... Transversus abdominis. This is the deepest of the abdominal muscles.

When it comes to training your abdominals, it's important to include the deepest layer of this muscle group — the transversus abdominis, which is responsible for flattening the stomach.