Ju-jitsu is an ancient Japanese martial art that has been practiced for more than 2500 years. In feudal Japan, samurai used the martial art to defend themselves against armed opponents. From the early 1600s to late 1800s, more than 700 systems of ju-jitsu existed.
Although there are many variations of ju-jitsu, it consists primarily of grappling techniques that are based on using the attacker's energy against him. Methods of combat include striking, throwing, restraining, and weaponry. The defensive tactics include blocking, evading, off-balancing, blending and escaping. Ju-jitsu is the parent of many other martial arts, including judo and aikido.
The participant competes with the opponent of the same weight category.
The competitors wear ju-jitsu gi without rolling up the sleeves or trousers. The gi jacket must cover the hips and half of the forearm; pants must be loose fitted and cover half the shin. One competitor wears a blue belt while the other wears a red belt.
The international level competitions are held in 12m by 12m tatami. The competition area is the center 8 by 8m, surrounded by a 1-m warning area of a different color. National competitions are held on a 10m by 10m tatami with a 6m by 6m competition area and a 1-meter warning area. The outside meter of tatami isthe warning area.