neigong training incluedes many kinds , but we can divide it into two parts , one part is related to healthy which is cross listed with the term Nei Jing. another is corss liste with Chinese martial arts ,in fact neigong is key factor of chinese martial arts. for example,in boxing and karate , old defeat young thin defeat strong is alomost impossible but in chinese martial arts it is very common my teacher is over 50 and 52 kilogrames but he can defeat the boxer who is only 28 and is over 90 kilograms. he depends neigong. the neigong training is always the secret of chinese martial arts beacause cluture , language and tradition. but now it is better than before in seveal days i will write a detailed passage to introduce neigong