Which muscle is part of the Inner Core Unit?

• A. Transversus Abdominis
• B. Rectus Abdominis
• C. Latissimus Dorsi
• D. Gastrocnemius

Answer: (A)

Transversus Abdominis is a deep stabilizer that forms the inner layer of the trunk, acting like a corset to brace the spine from the inside. In Pilates, activating this muscle helps maintain a neutral spine and stable pelvis before limb movements, which is why it belongs to the Inner Core Unit. The Rectus Abdominis is the superficial muscle that flexes the spine and isn’t the deep stabilizer. Latissimus Dorsi is a large back/arm muscle, not part of the inner core stabilizers. Gastrocnemius is a calf muscle with no role in trunk stabilization. So the deep stabilizing role of Transversus Abdominis makes it the correct choice.