Chung Do Kwan is the first style of Taekwondo officially proclaimed in 1944 in Korea, after the liberation of the country from Japanese occupation.
Its techniques were targeted on street fight, with an emphasis on power through the very good use of waist and coordination of all forces generated by the body parts. From the beginning, it was a system for efficiency in free fighting. There were no athletic games.
It is influenced by the Japanese Karate, the Korean Taekkyon, the Hwarangdo and Subak. Of course its style is very different from the aforementioned.
In terms of training it was the toughest and most rigorous. The next Kwans emerged from its crust.