Ninjutsu originated in China in the first centuries of the new era. Called by various names: Yin Sen Shu (a method of disappearing the body), Fa Shu (black arts) and others, it served espionage since ancient times, practiced by secret societies - closed organizations, similar in nature to sects.

After being transferred to Japan in the 7th-8th century, it first developed around Kyoto in the mountainous regions of Iga and Koga. It then spread throughout Japan, but these mountains remain the main center of Ninjutsu. Translated, Ninjutsu means "The Art of Being Invisible" or "The Art of Being Patient."

Ninjas were used to destabilize the enemy, political assassinations, and to deliver vital information about the position of enemy troops that could be decisive in any battle. Superpowers are often attributed to them, which caused fear in the ranks of even the brave samurai. For the ninja, the main weapon was surprise, and of course the fear that the very mention of the word "ninja" evokes. This made them one of the most hated and despised people in Japanese society. The ninjas were not afraid. They were subordinated only to their interests, their best friend was the darkness.

The ninjas were women and men. It often happened that a female ninja (kunoichi) seduced her victim and killed him. The training was hard, sometimes ending in death. Among the skills they possessed were: acrobatics, fencing, hand-to-hand combat, wrestling, climbing, swimming and enduring long underwater, enduring cold and heat, standing still for days, suppressing hunger and more.

The ninjas used a wide range of weapons and devices such as swords, shurikens and chains, most often hidden and arousing suspicion, for example in a stick or on the periphery of a straw hat. In addition, they were experts in the preparation of poisons, potions and bombs. They understood chemistry, physics, astronomy, mathematics and acupuncture. They were also trained in the "art of disguise," which they often used to avoid being seen in cities and to sneak unnoticed into nature. It is believed that the ninja was the first to construct a glider as a device for attacking samurai fortresses.

Manriki-gusari is a traditional Japanese and Chinese weapon with a chain, at the end of which are two weights designed to hit or capture the enemy. Another tactic is to grab the weights with one hand and throw them in the other person's face, which leads to unconsciousness or death. Another possibility is to throw the weapon itself against the opponent, which can cause shock or surprise. In most cases, this weapon is used as a surprise. Usually the manriki-gusari is about 90 cm (three feet) long. This weapon is one of the traditional weapons in the martial art of ninja.

Additional uses of the weapon are, for example, its use as a piercing weapon (spike and chain) in conjunction with the chain weapon. In this use, the chain is longer - about 1.8-3.04 m, with weight at both ends, each of which can be used separately. It is also possible to use both at the same time when the holder places a central handle on the chain.

The Shinai is a bamboo sports equipment simulating a sword. It is used for training in kendo and other martial arts. Usually imitates the Japanese katana sword. In kendo, both the "cutting" part of the shinai and its tip are used for striking. When used for practice, the shinai minimizes the danger of killing and injuring oneself or an opponent, compared to a sword.

Shinai consists of four specially profiled bamboo strips, made up of a square or vertical rectangle and fastened with two pieces of leather, as well as ropes, a handle and a tie, a protective device and its rubber or leather fastener. The bamboo strips are held together on both sides by leather handles and a tip, which in turn are secured with a rope. A tie is used to mark the striking part of the shinai and to ensure a good tension on the rope. Nowadays, variants of carbon fiber are also used instead of bamboo.

Shuriken is the common name for Japanese concealed weapons designed for throwing. The word shuriken, consisting of the signs "Shu", "Ri" and "Ken", literally translates as "blade hidden in the hand".

There are two main types of shurikens, which are: bo shuriken - long, thin cylindrical rods of various shapes and thicknesses, and shaken - made of flat metal discs.

Undoubtedly, the shuriken is best known as a weapon used by the ninja. Unlike the samurai, throwing weapons were a major arsenal for the ninja, perhaps because the ability to kill the enemy at a distance was entirely in their best interests.

Some of the types of shuriken they wore were:
Wedge-shaped, which they hid in their sleeves and in the saya (Ninja's scabbard) and often smeared with poison or paralyzing substances.
Star-shaped, pyramidal and rectangular, which were often thrown into the ground while escaping to slow down the enemy.

Usually masked killers wore 9 shurikens because they thought that number brought them luck. Smoke or gunpowder firecrackers were often attached to large terra shurikens, using them to cause panic when attacking.

Sai is the name of one of the traditional weapons in Eastern martial arts. Due to the specifics of the time, Chinese peasants were forbidden to carry weapons and they were forced to learn to defend themselves with the permitted agricultural implements. Sai, originally used as an agricultural tool for collecting and moving rice straw and hay, later became one of the few permitted agricultural implements suitable for dual use and as a weapon. It is about 50 cm long trident with a significantly longer middle tooth and usually curved outward lateral teeth. The traditional sai has no cutting blades, only pointed tips.

In the Middle Ages, copying from China and the creation of new techniques for fighting sai began on the island of Okinawa. The masters usually carried three sais, one of which was used as a throwing weapon and the other two for fencing. Like most weapons in Kobudo, the sai is used in pairs in each hand. Contrary to popular belief, the usual sai fighting technique is not similar to the knife technique. Sai is often held back to the base of one of the lateral teeth and is used to protect the forearm against sword blows and the lateral teeth as hooks for gripping it. The strokes are mostly poked with the handle, but there are also twists and blocks, very rarely grabbing the handle. Sai katas and punches are very similar to traditional karate. Sai is considered an integral part of the arsenal of most karate styles.