The Functional Lines consists of three distinct components: the front, back, and ipsilateral lines, each supporting different aspects of movement. The front functional line links the chest’s pectoralis major across the body to the opposite hip’s adductors, facilitating forward and cross-body actions. The back functional line connects the latissimus dorsi on one side, across the lower back through the thoracolumbar fascia, to the opposite side’s gluteus maximus and hamstring, aiding in backward and lifting movements. The ipsilateral line runs along the same side from the shoulder to the hip, crucial for lateral movements and enhancing stability during side-bending or twisting. Together, these lines enable a comprehensive range of dynamic movements and stability across various planes of motion.

The Arm Lines denote four distinct myofascial meridians that traverse from the axial skeleton through various planes within the shoulder, extending along all sides of the arm and reaching the hand. These lines feature a network of cross-over structures facilitating the high mobility of the arms, whereas the legs prioritize stability. The terminology of these arm lines derives from their intersections with the shoulder. They seamlessly integrate with other fascial lines throughout the body, enabling the arms to perform various movements, including pushing, pulling, rotations, and intricate manipulations, essential for executing advanced movements with precision and coordination.