The Superficial Front Line (SFL) is a continuous myofascial connection that spans the entire front side of the body, extending from the tops of the toes, running up the front of the legs, along the torso, and ultimately reaching around to the sides of the skull. In terms of posture, the primary role of the SFL is to maintain balance in conjunction with the Superficial Back Line (SBL) and to facilitate the elevation of the pelvis, rib cage, neck, and head. In terms of movement, the SFL is responsible for creating flexion in the upper body and hip region, causing a forward bending motion, as well as promoting the extension of the leg at the knee joint and the bending of the foot in a direction toward the nose, a movement known as dorsiflexion.

The Superficial Back Line (SBL) is a continuous tensile myofascial structure that originates at the underside of the foot and extends along the entire back side of the body, continuing up and over the head, ending at the forehead. The primary function of SBL is to promote extension in the body. It plays a crucial role in erecting and maintaining an upright posture. It provides essential strength for overall bodily support while posturally counterbalancing the superficial front line. This myofascial connection essentially acts as a structural support system, contributing to the body’s ability to stand tall and maintain an upright position.