The Bujinkan Dojo (warrior-spirit school), is a martial arts organization headed by Grandmaster Masaaki Hatsumi in Noda, Japan.
The training is generally referred to as ninjutsu, taijutsu, or budo taijutsu. It is composed of both armed and unarmed methods of fighting. Unarmed methods are broken down into three primary categories, dakentaijutsu (striking forms), jutaijutsu (grappling forms), and taihenjutsu (body movement skills). A variety of weapons are taught, such as sword, staff, spear, halberd, etc in class and through special events.
The Bujinkan Nassau Dojo only accepts students 21 years of age and older. No exceptions. This keeps the training intensity at a level appropriate for all students.
Ranking structure begins with kyu grades below the rank of black belt. Kyu ranks wear green belts. Beyond this ranking there are ten levels (dan) of black belt. To attain 5th dan, the practitioner submit to a test before the Hatsumi Sensei to establish that they are able to sense the presence of danger and evade it, considered to be a fundamental survival skill. This is called the sakki. A practitioner ranked as godan can apply to become a licenced teacher (shidoshi). A shidoshi is entitled to open his own dojo, and hand out ranks up to 4th dan as he wishes. A person who has been given 10th dan (judan) in the Bujinkan is often referred to as a shihan.