Because striking against an armored opponent proved ineffective, practitioners learned that the most efficient methods for neutralizing an enemy took the form of pins, joint locks, and throws. These techniques were developed around the principle of using an attacker's energy against him, rather than directly opposing it.
Japanese Jujutsu systems typically emphasize more on throwing, pinning, and joint-locking techniques as compared with martial arts such as karate, which rely more on striking techniques. Striking techniques were seen as less important in most older Japanese systems because of the protection of samurai body armor and were used as set-ups for their grappling techniques. However, many modern-day Jujutsu schools include striking, both as a set-up for further techniques or as a stand-alone action. Japanese Jujutsu holds the distinction of being the inspiration and / or "father" of many well known martial arts today such as Judo, Aikido, Aikijujutsu, Brazilian Jiu-jitsu, etc.
Aikijujutsu is an advanced form of Jujutsu which emphasizes "an early neutralization of an attack." Like other forms of Jujutsu, it emphasizes throwing techniques and joint manipulations to effectively control, subdue or injure an attacker. It emphasizes using the timing of an attack to either blend or neutralize its effectiveness and use the force of the attacker's movement against them.
Aikijujutsu is characterized by the ample use of atemi, or the striking of vital areas, in order to set up their jointlocking or throwing tactics. One of the unique characteristics of the art is defense against multiple attackers based on the movement principles and control techniques of Kenjutsu (swordsmanship).
Kenjutsu is the umbrella term for all schools of Japanese swordsmanship, in particular those that predate the Meiji Restoration. The modern styles of kendo and iaido that were established in the 20th century included modern form of ken-jutsu in their curriculum, too. Kenjutsu, which originated with the samurai class of feudal Japan, means "the method, technique or the art of the sword." This is opposed to kendo, which means "the way of the sword".The exact activities and conventions undertaken when practicing ken-jutsu vary from school to school, where the word school here refers to the practice, methods, ethics, and metaphysics of a given tradition, yet commonly include practice of battlefield techniques without an opponent and techniques whereby two practitioners perform kata (featuring full contact strikes to the body in some styles and no body contact strikes permitted in others). Although kata training was always the mainstay, in later periods, schools incorporated sparring under a variety of conditions, from using solid wooden bokutō or bokken to use of bamboo sword (shinai) and armor (bōgu).