Grandmaster (martial arts) of "Dan" rankings and Black belt and Red belt in martial arts both derive from Judo where they were adopted by its founder Kanō Jigorō. There are many terms similar or equivalent to 'grandmaster' used by various martial arts traditions. Some of these terms derive from older systems, while others are relatively modern. Japanese martial arts commonly use Sensei (先生) meaning "teacher" or literally translated, "born first" or "one who has gone before". A "Sensei" is a person who has knowledge and is willing to teach that knowledge to another. A "Sensei" assists students in "ken shiki" "the pursuit of
Japanese martial arts are deeply interrelated concepts applicable to self-defense and competitive combat. They each denote different considerations relevant to successfully initiating or countering an attack. In Japanese martial arts, is "the decisive moment when a killing action is initiated." There are two types of initiative in Japanese martial arts, , and . Each type of initiative complements the other, and has different advantages and weaknesses. Early initiative is the taking advantage of an opening in an opponent's guard or concentration ("see "suki", supra"). To fully take the early initiative, the attack launched must be with total commitment and lacking in any hesitation,