Editing Neijia (section)

==Sun Lutang==
Sun Lutang identified the following as the criteria that distinguish an internal martial art:
# An emphasis on the use of the mind to coordinate the leverage of the relaxed body as opposed to the use of strength.
# The internal development, circulation, and expression of ''[[qi]]'', the "vital energy" of classical Chinese philosophy.
# The application of [[Taoist]] ''[[daoyin]]'', ''[[qigong]]'', and ''[[neigong]]'' principles of external movement.

[[Sun-style tai chi|Sun Lutang's eponymous style of tai chi]] fuses principles from all three arts he named as ''neijia''.<ref>{{Cite journal|last= Yip|first= Li (Faye)| title= Principles and Practice of Sun Style T'ai Chi | journal = T'ai Chi, the International Magazine of T'ai Chi Ch'uan | volume = 22 | number = 2 | publisher = Wayfarer Publications|date=April 1998|issn= 0730-1049}}</ref> Similarities applying classical principles between tai chi, ''xingyi'', and ''baquazhang'' include:  Loosening (song) the soft tissue, opening shoulder and hip gates or ''gua'', cultivating ''qi'' or intrinsic energy, issuing various ''jin'' or compounded energies. Tai chi is characterized by an ever-present ''peng jin'' or expanding energy. ''Xingyiquan'' is characterized by its solely forward moving pressing ''ji jin'' energy. ''[[Baguazhang]]'' is characterized by its "dragon body" circular movements.  Some Chinese martial arts other than the ones Sun named also teach what are termed internal practices, despite being generally classified as external (e.g. [[Wing Chun]] that also is internal {{Citation needed|date=September 2016}}). Some non-Chinese martial arts also claim to be internal, for example [[Aikido]] and [[Kito Ryu]].{{citation needed |date=March 2019}} Many martial artists{{Who|date=June 2011}}, especially outside of China, disregard the distinction entirely{{Citation needed|date=June 2011}}. Some ''neijia'' schools{{Who |date=June 2011}} refer to their arts as "[[Hard and soft (martial arts)|soft style]]" martial arts.