The famous Korean historian, Dr. Danjee Shin Chae Ho, in his writings of ancient Joseon , describes the contests of skill and courage under grueling conditions:
"Dancing with swords and certain water sports were held on the frozen river to test a contestant's courage and perseverance. Archery and Taekkyon contests were held to test skill and power. The winner of the hunt was given the title of son-Bi. All of the above were judged to be necessary prerequisites of the warriors, and the winners were held in esteem by all."
Dr. Danjee states further, that the art of Subak was eventually introduced to China as kwon bup and as a form of Jujitsu to Japan.