It is well known that the show's creators based each bending style on an existing martial art. Waterbending was based off link
, Earthbenders off link
, for the most part, Firebenders off link
and Airbenders link
While ATLA focused on mastering these fighting styles in a physical sense that is only on single facet of the training that goes into becoming a master of the martial arts. Body is the easiest. Mind was covered though the opening of the link
, a real concept featured in tantric and yogic traditions of Hinduism and Buddhism. If we assume that the writers put as much study and research...