The focus in our discussion of longevity-enhancement has centered on developing techniques and technologies to control the environment as well as the physical body and its functions. The Tibetan contemplative and medical sciences offer a sophisticated view of the mind-body complex in which efforts to control the external world are insufficient without the development of "inner" technologies to train the mind. From the Tibetan perspective, training the mind is in fact essential to the realization of extraordinary levels of longevity, happiness, and optimal health.