thumb|right|Development of the immortal embryo in the lower dantian of the Daoist cultivator Neidan, or internal alchemy (), is an array of esoteric doctrines and physical, mental, and spiritual practices that Taoist initiates use in hopes to prolong life and create an immortal spiritual body that would survive after death. Also known as Jindan ( "golden elixir"), internal alchemy combines theories derived from external alchemy (waidan ), correlative cosmology (including the Five Phases), the emblems of the Yijing, and medical theory, with techniques of Taoist meditation, daoyin gymnastics, an
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thumb|right|Development of the immortal embryo in the lower dantian of the Daoist cultivator Neidan, or internal alchemy (), is an array of esoteric doctrines and physical, mental, and spiritual practices that Taoist initiates use in hopes to prolong life and create an immortal spiritual body that would survive after death. Also known as Jindan ( "golden elixir"), internal alchemy combines theories derived from external alchemy (waidan ), correlative cosmology (including the Five Phases), the emblems of the Yijing, and medical theory, with techniques of Taoist meditation, daoyin gymnastics, and sexual hygiene.
In neidan practice, Taoists claim the human body becomes a cauldron (or "ding") in which the Three Treasures of Jing ("Essence"), Qi ("Breath") and Shen ("Spirit") are 'cultivated' for the purpose of improving physical, emotional and mental health, and ultimately returning to the primordial unity of the Tao, i.e., attaining Taoist Immortality. It is believed the Xiuzhen Tu is such a cultivation map. In China, this act is an important form of practice for most schools of Taoism.
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