The Superficial Back Line (SBL) is a continuous myofascial chain that begins at the soles of the feet, travels up the entire back of the body, extends over the head, and ends at the forehead. Its primary function is to support body extension, playing a key role in maintaining an upright posture. The SBL provides essential strength for structural stability and counterbalances the Superficial Front Line. This connection acts as a fundamental support system, enabling the body to stand tall and sustain an erect position.

The Deep Front line serves as the body’s myofascial “core,” and supports and stabilizes the body’s structure. Starting from the feet with the short toe flexors, it ascends through the tibialis anterior along the shin, includes deeper thigh muscles like the adductors and the psoas, and incorporates the pelvic floor and diaphragm. It continues up to the neck’s deep cervical flexors. Essential for maintaining posture and balance, the DFL is integral to core stability, efficient movement, and integrating the body’s parts, which is especially beneficial in practices like yoga for improving stability and reducing injury risk.