User blog comment:Zathronas/Analysis by an author: Volume 2 episode 5: Extracurricular./@comment-10380701-20140829033510/@comment-24218038-20140829040926

My knowledge isn't extensive but the principle of QI (Chi) comes originally from Hindu where the flow of Prana (Hindu Chi equivalent) could be achieved through laughter. In chinese QI is achieved through breathing correctly.

I might be wrong here, That's what little I remember. I might be confusing with something else.