An hour long section of the Yi Jin Jing (Changing the Tendon Classic) theory taken from The Internal Arts Academy which can be found at: http://www.damomitchell.com This was a part of a 4.5 hour long series on the theory of Yi Jin Jing and its applications in Qigong practice. Understanding the theory of a practice such as Yi Jin Jing is an integral part of transforming the body in the correct way for many of the Chinese arts.