Base-Line Theory of Health and Movement: The Five Main Muscles of Movement and Conscious Proprioception.

A body that is balanced and aligned is in better health.

By Leigh Blyth B.V.M.&S.

The Five Main Muscles of Movement.

The main muscles of movement are the 5 paired (left and right side) muscles that are of key importance to our physical and mental well-being.

When properly functioning, the 5 main muscles of movement provide the central framework for the body to work as it should - strong, balanced and pain-free with a full range of natural movement and a good posture.

Our pelvic floor (actually a group of muscles), rectus abdominis, gluteus maximus, rectus femoris and trapezius muscles.

5 main muscles of movement

The Body's Base-Line.

Central to the main muscles of movement are our Base-Line muscles  pelvic floor 'Base', rectus abdominis 'Line'.


The gluteus maximus and rectus femoris muscles of each leg work in tandem, aligning the hip and knee joints and connecting our legs to Base-Line support.

The trapezius muscles should be free to fully extend in all directions, supporting the head and arms through a full range of movement. With Base-Line support in place, movement of the upper body should begin from the lower trapezius.

Conscious Proprioception.

Increased awareness of the sensory feedback from the body regarding its position, motion and balance is the basis of conscious proprioception.

conscious proprioception.

By focusing on how we use the main muscles of movement, centered around Base-Line we can develop this connection between body and mind, sensing and correcting our posture to reduce the stress and tensions (pain) our body experiences. Feeling how to heal by working through physical restrictions, regaining our natural range of movement, release the tensions and improve our sense of well-being.

Anatomy of Alignment

The body is aligned when all midline anatomy can be arranged on the straight line of the median plane.

The body is balanced when left and right sides in equilibrium either side of the median plane.

body alignment and balance

The linea alba (between the rectus abdominis muscles) is the primary midline reference for body alignment.

The supraspinous ligament and nuchal ligament (between the trapezius muscles) are our secondary midline anatomical guides for alignment.

The Pain of Misalignment

I believe that many of the chronic pain symptoms and syndromes currently classified as idiopathic e.g. fibromyalgia are due to the adaptations of the body when the main muscles of movement are not adequately functioning. Stresses on other muscles results in the myalgia of imbalance.

Physical restrictions form within the connective tissue system (due to inflammatory processes in response to trauma, infection, stress etc.) reduce range of movement resulting in stiffness and apply tensions throughout the body resulting in widespread painful symptoms and weird sensations.

adaptations and effects of not using
the 5 main muscles correctly

Chronic pain affects our mental well-being, and was the root cause of my long-term depression and mental health issues.

Focusing on how I use my body, working with the 5 main muscles of movement has changed my life. I feel better than I ever have before. The key to better health.

Leigh Blyth B.V.M.&S.

Optimising the use of your muscles = Better health.

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