Chi

"is thought of as a pseudoscience, but there are stories of it healing tumors and curing disease. So, maybe it's more real than i thought." "You know, chi is the breath of life. It is what powers the Iron Fist."

- Claire Temple and Davos

The Chi is a mystical form of life energy that is embodied in every life form. While most of the modern medical institution disproves its existence, some of organizations with mystical knowledge, like the Order of the Crane Mother and the Hand, have learned how to channel chi and used it for both therapeutic and martial art uses.

History
To be added

Chi Manipulation

 * Iron Fist: By channeling his chi and focusing it into his fist, Danny Rand and others with the title of the Iron Fist can make his fist inhumanly powerful and resistant to injury and pain. With his fist in this state, Danny can exert superhuman strength and force.