There is no real “rank” point where it starts. With the BKR, there are no formal requirements for weapons until after Shodan. Sword kata, bo-kata,
1. The kihon happo, or “infinite basics”, along with the movements of the San Shin no Kata, are considered the basic techniques and movements of Bujinkan Budo Taijutsu.
2. The Ten Chi Jin Ryaku no Maki, or “The Outline Scrolls of Heaven, Earth, & Man”, is considered the first training curriculum Hatsumi Sensei prepared for his students.
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