BO NO JUTSU:
The bō is usually made with hard wood, such as red or white oak, although bamboo has been used. The bō may be tapered in that it can be thicker in the center (chukon-bu) than at the ends (kontei) and usually round or circular (maru-bo). Older bō were round (maru-bo), square (kaku-bo), hexagon (rokkaku-bo) or octagon (hakkaku-bo). The average size of a bō is 6 shaku(around 6 ft (1.8 m)) but they can be a long as 9 ft (2.7 m) (kyu-shaku-bō) .
A 6 ft (1.8 m) bō is sometimes called a rokushakubō (六尺棒: ろくしゃくぼう). This name derives from the Japanese words roku (六: ろく), meaning "six"; shaku (尺: しゃく); and bō. The shaku is a Japanese measurement equivalent to 30.3 centimeters (0.994 ft). Thus, rokushakubō refers to a staff about 6-shaku (1.82 m; 5.96 feet) long. The bō is typically 3 cm (1.25 inch) thick, sometimes gradually tapering from the middle (chukon-bu) to 2 cm (0.75 inch)at the end (kontei). This thickness allows the user to make a tight fist around it in order to block and counter an attack.
In some cases for training purposes or for a different style, rattan was used. Some were inlaid or banded with strips of iron or other metals for extra strength. Bō range from heavy to light, from rigid to highly flexible, and from simple pieces of wood picked up from the side of the road to ornately decorated works of art.
Prior to the 15th century, Okinawa, a small island located south of Japan, was divided into three kingdoms: Chuzan, Hokuzan, and Nanzan. After much political turmoil, Okinawa was united under the Sho Dynasty in 1429. In 1477, Emperor Sho Shin of the second Sho dynasty came into power. Determined to enforce his philosophical and ethical ideas, while banning feudalism, the emperor instituted a ban on weapons. It became a crime to carry or own weapons such as swords, in an attempt to prevent further turmoil and prevent uprising. In 1609, the temporary peace established by Sho Shin was violently overthrown when the powerful Satsuma Clan invaded Okinawa. Composed of Japanese samurai, the Satsuma Clan took over the island, making Okinawan independence a thing of the past. The Satsuma placed a new weapons ban on the people of Okinawa, leaving them defenseless against the steel of the samurai’s swords. In an attempt to protect themselves from the devastating forces of the Satsuma, the people of Okinawa looked to simple farming implements, which the samurai would not be able to confiscate, as new methods of defense. This use of weapons developed into kobudo, or "ancient martial art," as we know it today.
Although the bō is now used as a weapon, its use is believed by some to have evolved from the long stick (tenbin) which was used to balance buckets or baskets. Typically, one would carry baskets of harvested crops or buckets of water or milk or fish etc., one at each end of the tenbin, that is balanced across the middle of the back at the shoulder blades. In poorer agrarian economies, the tenbin remains a traditional farm work implement. In styles such as Yamanni-ryū or Kenshin-ryū, many of the strikes are the same as those used for yari ("spear") or naginata("glaive"). There are stick fighting techniques native to just about every country on every continent.