Judo (meaning "gentle way", is a modern Japanese martial art (gendai budo) and combat sport, that originated in Japan in the late nineteenth century. Its most prominent feature is its competitive element, where the object is to either throw one's opponent to the ground, immobilize or otherwise subdue one's opponent with a grappling manoeuvre, or force an opponent to submit by joint locking the elbow or by executing a choke. Strikes and thrusts (by hands and feet)—as well as weapons defences—are a part of judo, but only in pre-arranged forms (kata) and are not allowed in judo competition or free practice (randori).

Ultimately, the philosophy and subsequent pedagogy developed for judo became the model for almost all modern Japanese martial arts that developed from "traditional" schools (koryu). In addition, the worldwide spread of judo has led to the development of a number of offshoots such as Sambo and Brazilian Jiu Jitsu. Practitioners of judo are called judoka.

Aikido is a Japanese martial art developed by Morihei Ueshiba (often referred to by his title 'O Sensei' or 'Great Teacher'). On a purely physical level it is an art involving some throws and joint locks that are derived from Jujitsu and some throws and other techniques derived from Kenjutsu. Aikido focuses not on punching or kicking opponents, but rather on using their own energy to gain control of them or to throw them away from you. It is not a static art, but places great emphasis on motion and the dynamics of movement.

jujutsu, means the "art or science of softness", is a Japanese martial art consisting primarily of grappling techniques. Jujutsu evolved among the samurai of feudal Japan as a method for dispatching an armed and armored opponent in situations where the use of weapons was impractical or forbidden. Due to the difficulty of dispatching an armored opponent with striking techniques, 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, and came to be known as jujutsu.

Kyokushin kaikan is a style of stand-up, full contact karate, founded in 1964 by Masutatsu Oyama who was born under the name Choi Yong-I. Kyokushinkai is Japanese for "the society of the ultimate truth." Kyokushin is rooted in a philosophy of self-improvement, discipline and hard training. Its full contact style has had international appeal (practitioners have over the last 40+ years numbered more than 12 million).

Kyokushin has influenced many of the "full-contact" schools of karate, emphasizing realistic combat, physical toughness, and practicality in its training curriculum. Many other martial arts organizations have "spun-off" from Kyokushin over the years, with some adding additional techniques, such as grappling, but continuing with the same philosophy of realistic and practical training methods.

Ninjitsu is an ancient body of spiritual and martial arts teachings designed for feudal Japanese spies and assassins. Practitioners, famously called Ninjas, developed the art in remote and mountainous areas of Japan to combat the Samurai landlords that rose to power about a millennia ago.

Shorinji Kempo was adapted from Chinese Kempo and is widely practiced in Japan. Shorinji Kempo combines religion, meditation and martial arts. It teaches a variety of techniques with striking and kicking as well as some Aikido style throws, locks and holds. Some Shorinji Kempo schools also teach a variety of healing methods.

Aiki-jujutsu is a 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. Daito-ryu is characterized by the ample use of atemi, or the striking of vital areas, in order to set up their jointlocking or throwing tactics. Some of the art's striking methods employ the swinging of the outstretched arms to create power and to hit with the fists at deceptive angles as can be observed in techniques such as the atemi which sets up gyaku ude-dori or 'reverse elbow lock'. Tokimune regarded one of the unique characteristics of the art to be its preference for controlling a downed attacker's joints with one's knee in order to leave one's hands free to access one's weapons or to deal with the threat of other oncoming attackers.