I’m Paul Willson I am a brown belt in Ju Jutsu, a centuries old Japanese martial art.
Chi in Chinese or Ki in Japanese is something that you will hear about on social media when it comes to martial arts. But is it real? The answer to that is an annoying absolutely not but well yes.
If you are expecting Chi or Ki to be some kind of Jedi power with the ability to manipulate people and objects which you will learn with enough martial arts training you are going to be most definitely disappointed because, even if it would be cool, that is bullshit. Just have a look on YouTube there is a lot videos of people promoting this, usually for a large fee.
However, like a lot of stuff taken from far eastern martial arts there is a western (deliberate) mistranslation.
The website https://japanology.org/2016/05/what-is-ki/ has an excellent description of chi or ki. Jesse Enkamp in his YouTube channel also has a good video about chi or ki.
So there you have it chi or ki means simply energy and in martial arts terms the efficient use of your own movement so you use the optimal amount of energy. Sadly no Jedi mind tricks.