This refers to strengthening a specialized group of deep abdominal muscles that support your lower back, pelvis and hip joints. (blog.errantsurf.com)
As the anatomically deepest abdominal muscle, the transversus abdominus helps with respiration and proper breathing and supports the spine. (blog.fitplanapp.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)