The deepest purpose of Sōng (loosening/releasing) transcends physical relaxation; it is the fundamental prerequisite for achieving substantial and unimpeded Internal Energy (Qi 氣) Circulation. Where muscular tension resists gravity and obstructs neural pathways (as covered in Section 4.1), it simultaneously creates blockages to the flow of Qi. Sōng serves as the energetic vehicle, opening the pathways for the body's internal power.
The connective tissue and joint spaces, when rigidly held by unnecessary muscular effort, act as dams in the body’s energetic river. When Sōng is correctly cultivated, the fascia softens and the joints "hang" freely, eliminating resistance and allowing the bio-electric and subtle energetic currents—the Qi—to flow through the pathways of the meridians and deep energetic vessels. This structural release is the mechanism by which external integrity becomes internal porosity.
True Sōng in the Yao (waist/lumbar spine) and Kua (hips/groin) is crucial for the energetic core. By releasing these areas, practitioners allow Qi to naturally and continuously "sink" and gather in the Lower Dān Tián (elixir field)—the primary reservoir for internal energy.
This Dān Tián integration is truly realized when the deep core fascia (including the transverse abdominis aponeurosis and thoracolumbar fascia) are fully connected to the entire fascial network out to the limbs. This creates a state of tensional integrity where the core acts as the unmoving center, transmitting force efficiently across the whole body.
This structural integration serves a dual purpose:
Gathering: It ensures the Dān Tián remains the stable center from which power (Jing) is issued, allowing force generated from the ground to instantly travel through the spine and fascial slings.
Sinking: It ensures the entire structure is properly rooted and connected to the ground, preventing the Qi from rising into the chest (a condition known as "Floating Qi" or "Suspended Breath").
When the structural and mental dimensions of Sōng are harmonized, the body's primary energetic conduits—the Microcosmic Orbit (the circulation of Qi through the Dū and Rèn meridians)—can function without impedance. Continuous, deep Sōng is required to relax the areas where these channels often constrict, such as the back of the neck, the lower back, and the perineum (Hui Yin, 會陰).
In this advanced state, Sōng is no longer an action but a state of being, maintaining a fluid, uninterrupted circulation that constantly nourishes the body and prepares the Jin (expressed power/force, 勁) for action. It transforms the practitioner into a vessel for continuous internal vitality.