The oldest Korean martial art was an amalgamation of unarmed combat styles developed by the three rival Korean kingdoms of Goguryeo, Silla, and Baekje, where young men were trained in unarmed combat techniques to develop strength, speed, and survival skills. The most popular of these techniques was subak, with taekkyeon being the most popular of the segments of subak. Those who demonstrated strong natural aptitude were selected as trainees in the new special warrior corps, called the Hwarang. It was believed that young men with a talent for the liberal arts might have the grace to become competent warriors. These warriors were instructed in academics as well as martial arts, learning philosophy, history, a code of ethics, and equestrian sports. Their military training included an extensive weapons program involving swordsmanship and archery, both on horseback and on foot, as well as lessons in military tactics and unarmed combat using subak. Although subak was a leg-oriented art in Goguryeo, Silla's influence added hand techniques to the practice of subak.
During this time the early masters gave a few select Sillan warriors training in taekkyeon from Koguryo. These warriors then became known as the Hwarang. The Hwarang set up a military academy for the sons of royalty in Silla called Hwarang-do, which means "the way of flowering manhood." The Hwarang studied taekkyeon, history, Confucian philosophy, ethics, Buddhist morality, social skills and military tactics. The guiding principles of the Hwarang warriors were based on Won Gwang's five codes of human conduct and included loyalty, filial duty, trustworthiness, valor and justice. Taekkyeon was spread throughout Korea because the Hwarang traveled all around the peninsula to learn about the other regions and people. In spite of Korea's rich history of ancient and traditional martial arts, Korean martial arts faded into obscurity during the Joseon Dynasty. Korean society became highly centralized under Korean Confucianism and martial arts were poorly regarded in a society whose ideals were epitomized by its scholar-kings. Formal practices of traditional martial arts such as subak and taekkyeon were reserved for sanctioned military uses. Civilian practice of taekkyeon, however, persisted into the 20th century.