Internal exercise.

Neigong 內功 , pinyin nèigōng, also spelled nei kung or neigung meaning "internal skill" is any of a set of Chinese breathing and meditation disciplines associated with Daoism and especially the Chinese martial arts. Neigong practice is normally associated with the so called "Soft Style", "Internal" or Neijia 內家 Chinese martial arts, as opposed to the category known as Waigong 外功 or "external skill" which is historically associated with Shaolin Quan or the so called "Hard Style", "External" or Waijia 外家 Chinese martial arts. Both have many different schools, disciplines and practices and in reality much cross over and sharing exists between the two and distinguishing precisely between them is the subject of much debate.