Muscles establish the most important restrictions to hip flexibility, but there is another restriction within the hip joint itself—the pubofemoral ligament—which is one of the three extension-limiting ligaments that spiral down to the neck of the femur from each of the three parts of the pelvis (fig. 3.6). Tension comes off these ligaments during a forward bend, but when we abduct the flexed thighs in a sitting posture, the head of the femur is pulled away from the acetabulum, and this creates tension in the pubofemoral ligament, which runs straight laterally from the pubis to the femur in the flexed and abducted thigh. In an anatomical dissection, this ligament may even have to be cut to permit full abduction of the flexed thigh. The pubofemoral ligament is one of the few ligaments in the body that can and should be stretched over a period of time by those who wish to use the classic sitting postures. In the absence of that need, leave it alone.
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A complete guide on Eastern practices of breathing, mental, psychic and spiritual development. The book teaches that Yoga is divided into several branches, ranging from that which teaches the control of the body, to that which teaches the attainment of the highest spiritual development.