Eventually, though, Grandmaster Kim reached the point where he could devote time to investigate his own injuries. Indeed, their continuation virtually forced him to. He began studying martial art more intensely while teaching, and he realized that he had been breathing improperly since his early training. From these and other insights Grandmaster Kim developed Chayon-Ryu. In Korea today, few train long enough to develop such long-term health problems or recognize their cause.
Students quit training from disinterest after only two or three years.
Research and development of better teaching methods has been unnecessary and nonexistent in contemporary tae kwon do sport organizations. In the United States, though, students often train for ten, fifteen or twenty years. If they get hurt, they will simply quit. Therefore, necessity has compelled improving training methods so students could continue. Likewise, the reason people study martial arts has changed for modern society.