 
The core is better known as the lumbo-pelvic-hip complex which involves anatomic structures of the lumbar spine, pelvic girdle and hip joint. The body’s center of gravity relies on these 29 muscles that are attached to the pelvis and/or spine. The core is the unity responsible for proper posture and is the structural beginning and ending point for all movement.
The two categories which create the core is the deep muscular system (inner unit) and the global muscles (outer unit). The deep unit are mainly muscles which attach to vertebrae, pelvis and sacrum to provide stabilization of the spine. These muscles usually do not provide movement, however they are key stabilizers. The outer muscular system of the core are muscles that usually attach to the rib cage and legs. Some of these muscles include the hamstrings, adductors, rectus abdominus, and erector spinae.
Deep Muscular System
Transverse abdominis
Posterior fibers internal oblique
Lumbar multifidus
Pelvic-floor muscles
Outer Muscular Systerm
Rectus abdominis
Anterior fibers of internal oblique
External oblique
Erector spinae
Iliopsoas
Adductors
Hamstrings
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