Which muscle is NOT part of the core/inner unit?

• A. Transverse Abdominus
• B. Psoas
• C. Pelvic floor
• D. Diaphragm

Answer: (B)

The psoas is not considered part of the core or inner unit. The core, often described as the stabilizing region of the body, primarily includes muscles that control posture, stabilize the spine, and support pelvic and lumbar function. These muscles are more directly connected to the pelvic floor, diaphragm, and transverse abdominus.

The psoas, while it plays a significant role in hip flexion and contributes to overall stability, is primarily associated with movement rather than the stabilization provided by the inner core muscles. Therefore, the psoas doesn't meet the criteria of the core inner unit, which focuses on muscular activation that supports and stabilizes the body rather than facilitating movement.

Understanding this distinction is crucial for forming effective training and rehabilitation programs that target core stability. The other muscles mentioned are integral to the functional stability of the core.