Fascia, a connective tissue, is the packing material of the body. It envelopes the muscles, bones and joints and holds us together supporting the body structure and giving us our shape. Fascia organizes and separates: it provides protection and autonomy for the individual muscles and viscera. It joins and bonds these separate entities and establishes spatial relationships. Chemically it is the collagen in the fascia that enables it to change.
Collagen, a colloid is capable of changing from fluid to solid, and solid to fluid in response to the forces acting upon it. With chronic tension collagen tends to shorten and harden. Structural Integration rehydrates and restores elasticity to the fascia.