The phrase "abdominal muscles" refers to the group of muscles found in your belly area. These muscles help you bend, twist, and stabilize your body. Full definition
So be sure you're adding moves that target your lower back as well as the different layers of abdominal muscle too! (thebettyrocker.com)
This equipment helps to train abdominal muscles in two ways. (abmachinesguide.com)
Think of your deep abdominal muscles as the foundation of any body movement; hence it is extremely important to build this often forgotten muscle group in young developing athletes. (sportstarsmag.com)