The Spiral Line (SPL) loops around the the body in a double helix, joining each side of the skull across the upper back to the opposite shoulder, and then around the ribs to cross in the front at the level of the navel to the same hip. From the hip, the SPL passes like a &#x27;jump rope&#x27; along the thigh and shin to the medial arch, passing under the foot and running up the back and outside of the leg to the ischium and into the erector myofascia to end very close to where it started on the skull.