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What Is Judo?

Judo is a Japanese martial art and Olympic sport focused on throwing opponents to the ground, pinning them, and applying joint locks or chokes to force submission. Founded by Jigoro Kano in 1882, judo was designed as a safe, systematized version of traditional jiu-jitsu that could be practiced at full intensity without serious injury. The name means “the gentle way” — which is somewhat ironic when you are being thrown over someone’s hip onto a mat at full speed.

The Founding Idea

Kano was a small man — about 5’2” and 90 pounds as a young student — who studied traditional jiu-jitsu to defend himself against bullies. He recognized that many jiu-jitsu techniques were dangerous and could not be practiced safely at full speed. His innovation was removing strikes, kicks, and the most dangerous joint locks, creating a system where practitioners could spar (“randori”) at maximum effort without serious injury.

The core principle is maximum efficiency, minimum effort (seiryoku zenyo). Use your opponent’s force and momentum against them. A well-timed hip throw uses the attacker’s forward motion to send them airborne — the defender provides direction, not power.

The second principle is mutual welfare and benefit (jita kyoei). Judo is meant to develop the whole person — physical fitness, mental discipline, and moral character. Kano saw judo as education, not just combat.

How It Works

Judo techniques fall into three categories:

Nage-waza (throwing techniques) — the most distinctive aspect. Throws use use, timing, and off-balancing (kuzushi) to project an opponent through the air onto their back. Major categories include hip throws (koshi-waza), shoulder throws (te-waza), and leg techniques (ashi-waza). A perfect throw — called ippon — ends the match immediately.

Katame-waza (grappling techniques) — once on the ground, judoka use pins (osaekomi-waza) to hold opponents on their backs for 20 seconds (ippon), arm locks (kansetsu-waza) targeting the elbow joint, and chokes (shime-waza) using the gi or body positioning. Only elbow locks are permitted; wrist, knee, and spine locks are illegal.

Ukemi (falling techniques) — arguably the most important skill. Learning to fall safely — distributing impact across a large surface area, tucking the chin, slapping the mat to absorb force — prevents injury and enables fearless practice.

Competition

Olympic judo matches last 4 minutes on a 10x10 meter mat. Competitors wear white or blue judogi (uniforms). Scoring:

• Ippon (full point) — a clean throw onto the back, a 20-second pin, or submission by arm lock or choke. Match ends immediately.
• Waza-ari (half point) — a throw that is almost ippon but lacks full force or back landing. Two waza-ari equal ippon.

Matches are divided by weight class (seven for men, seven for women). Judo has been an Olympic sport since 1964 (men) and 1992 (women). Japan and France traditionally dominate, though strong competitors come from dozens of countries.

Belt System

Judo uses the colored belt ranking system (kyu/dan) that most martial arts adopted:

Beginners start at white belt and progress through yellow, orange, green, blue, and brown before reaching black belt (first dan). Black belt itself has ten degrees — from shodan (first degree) to judan (tenth degree, held by only a handful of people in history).

Promotion through colored belts requires both technical knowledge and competitive results. Black belt is not an endpoint — Kano intended it as the beginning of serious study, when fundamentals are sufficiently mastered to begin really learning.

Judo’s Global Reach

Judo is practiced in over 200 countries with an estimated 40 million practitioners worldwide. It is the most widely practiced martial art in the world (when measured by international federation membership) and is popular across all continents.

France has more judo practitioners per capita than Japan — roughly 600,000 registered judoka compared to Japan’s 160,000. Judo is part of the French school physical education curriculum. Brazil, Germany, Russia, and South Korea also have strong traditions.

Why People Train

Judo offers practical self-defense (throwing someone who grabs you is highly effective), excellent physical conditioning (the sport builds grip strength, core stability, and cardiovascular fitness), and mental discipline. The culture of respect — bowing to partners, following dojo etiquette, helping newer students — creates a structured, supportive training environment.

For parents considering martial arts for children, judo is one of the safest options. The emphasis on falling safely means injuries are less common than in striking arts, and the no-striking rule removes the most concerning elements of combat training for young practitioners.

Frequently Asked Questions

What does judo mean?

Judo means 'the gentle way' in Japanese — from 'ju' (gentle/flexible) and 'do' (way/path). The name reflects the founding principle that a smaller, weaker person can defeat a larger opponent by using technique and leverage rather than brute strength. Despite the gentle name, competitive judo is physically demanding.

What is the difference between judo and jiu-jitsu?

Judo was derived from traditional Japanese jiu-jitsu by Jigoro Kano in 1882, who removed the most dangerous techniques and created a system safe for full-speed practice. Judo emphasizes standing throws; Brazilian jiu-jitsu (which evolved from judo) emphasizes ground fighting. Traditional Japanese jiu-jitsu includes strikes, weapons, and lethal techniques that judo excludes.

How long does it take to get a black belt in judo?

Typically 4 to 6 years of regular training, though this varies by individual talent, training frequency, and organization. The journey progresses through white, yellow, orange, green, blue, and brown belts before reaching first-degree black belt (shodan). Black belt is considered the beginning of serious study, not the end.

Further Reading

• International Judo Federation
• Kodokan Judo Institute
• USA Judo