I'm Learning Martial Arts in Another World

Does this world really have national martial arts and martial arts? Tang Jin never believed it in his life of more than 20 years before, until he came to another world. In this world, martial arts really exists, and it can even affect the pattern of a country or even the world. Of course, the above has nothing to do with Tang Jin, because the most important thing to him at the moment is how to learn martial arts well and survive.