Among the Six Doctrines, gtum-mo is considered as qi training, while others are considered as religious training.        Che Huo refers to a sudden burst of fire in the body. The sudden burst of fire can make the body  heat up. Ding        refers to deep trance achieved by advanced meditation.   The term "Treasure Pot" is sometime used instead of "Zhuo Huo Ding." Actually, Treasure Pot is the foundation of Zhuo Huo Ding. The training method is to place a writing of half "A" or short "A" (Sanskrit) at the navel and visualize that the writing  is giving out a strong red light. The posture involves tilting the tail bone forward and drawing the anus upward.