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The “Core” as a Cylinder

The “Core” as a Cylinder

September 10, 2025 by Jean Massé

The word “core” is used quite often in gyms and by fitness professionals but it is rarely described further than that. When we talk about the “core” of the body, we are referring to a pressurized cylinder in the center of the body. This cylinder is where efficient posture and breathing should be derived from. The top of the cylinder is the respiratory diaphragm as depicted. This is the main muscle, along with the ribcage muscles, we are meant to use for inhalation. The pelvic floor (pelvic diaphragm) is on the bottom of the cylinder. The abdominals and connective tissues of the low back region make up the sides of this cylinder – anchoring both the respiratory diaphragm above, and pelvic floor (pelvic diaphragm) below. Like any mechanical cylinder, pressure in this “core” cylinder is meant to create an effective pump. Too much strength in one place like a tight neck or back, or not enough strength elsewhere like a weak pelvic floor or abdominal wall create imbalance in the cylinder much like a dented can might look. The primary work of the core is to pump air efficiently, in and out of the body. It’s the most important thing any of us does each day. Since breathing is essential to our survival we will do it somehow, some way. If we don’t do it with an efficient “core” cylinder, we with have to compensate and work harder than we are meant to for breathing. Compensation (with an inefficient cylinder) in our patients often comes in the form of neck pain, back pain, hip pain and the list goes on. One of the benefits of improving posture and “core” strength through the Postural Restoration approach, is that it requires us to establish efficient breathing, balanced postures and fluid movement patterns (http://www.posturalrestoration.com).

Filed Under: Breathing, Postural Restoration

About Jean Massé

Jean Masse PT, DPT, PRC, OCS, ATC has never stopped working to understand the elegance of human structure and movement. She blends her passion for movement and function with patience, knowledge and consideration of each patient as an individual

1709 Legion Road
Suite 100
Chapel Hill, NC 27517-2373
(919) 932-7266

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Advance Physical Therapy, Advanced Physical Fitness, and Scoliosis and Postural Restoration Center are proudly owned and operated by KJC Corp. We are a local, physical therapist owned, female owned small business. We have been serving Chapel Hill, the surrounding, and now international communities! proudly since 1999. We are so grateful for your patronage and health partnership.

Our therapists are highly experienced in traditional physical therapy techniques and have specialized expertise in a variety of areas, including: Postural Restoration, Scoliosis Rehabilitation, Orthopedics and Sports Medicine, Manual Therapy, Dry Needling, Counterstrain, Custom Foot Orthotics, Yoga, Personal training and Small Group Fitness.

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