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15 votes
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Could Non Newtonian fluids make better judo mats?

There are non-Newtonian fluids that get harder when stressed (like cornflour and water), and there are others that get softer when stressed (like tomato ketchup, that acts solid until you apply stress ...
Nullius in Verba's user avatar
14 votes

Is there such a thing as a toxic sensei? How to deal with one like that?

Toxic people Yes, there are toxic people in the martial arts world. Martial artists are human, and although martial training can improve character, martial artists are just as capable at being ...
mattm's user avatar
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13 votes
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In competition Judo can you use improvised techniques or throws that are not "officially" named?

Judo competition is not graded on the name of the technique you do. It's graded on whether you throw the opponent on their back, pin them, strangle them, put them in an armlock, or break the rules. So ...
Dave Liepmann's user avatar
12 votes
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De-ashi-harai or De-ashi-barai?

In Japanese, some6 initial consonants become voiced when they occur internal to some5 compound words, e.g: (unvoiced) (voiced) kimono judo-gi koshi-guruma o-goshi katame-waza kesa-gatame shime-...
brazofuerte's user avatar
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12 votes
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Should I give up my back on purpose so that I can do this throw?

You do not purposefully give your back. You do not "give" anything. Applied correctly, your back is safe. There are some misconceptions here. You do not simply "give your back". Throwing is something ...
Philip Klöcking's user avatar
11 votes
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Karate and Judo?

Wrestling and kyokushin karate go together fine. Most martial arts that cover different disciplines (e.g. striking/wrestling, or punching/kicking) work fine together because they complement each other....
Dave Liepmann's user avatar
11 votes
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What's the name of this sweep and where did it originate?

You're describing the knee push variation of "Scissor Sweep." It's very common in Brazilian Jiu Jitsu. There are two main ways to do it from full guard. Both involve getting control of one arm in ...
coinbird's user avatar
  • 1,801
11 votes

How can I practice any martial art if I have difficulty with motor and coordination skills?

Martial arts are a journey on your own path, at your own time and speed. I have (or have had) a number of students with wide ranging issues with co-ordination, flexibility and movement. As an ...
Collett89's user avatar
  • 2,984
11 votes

What is the good path to become a Judo teacher?

Generally the way to become a good instructor is experience. Instruct at your club whenever you have the opportunity - get better at dealing with students and explaining things in a way that they ...
Collett89's user avatar
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10 votes
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What Level Of Expertise Did Theodore Roosevelt Have In Judo?

Roosevelt's Judo experience Roosevelt trained judo under two instructors (John O'Brien, and Yoshiaki Yamashita) for a period of around a few months each in 1902 and 1904. He maintained an interest in ...
brazofuerte's user avatar
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10 votes
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Judo - Why does the ref sometimes pause the match when it goes to the ground?

If there's a lack of progress during ground work in a judo match, the referee will stand the competitors up. This is intended to encourage action, rapid attack, and prevent stalemate positions.
Dave Liepmann's user avatar
10 votes

Why grip with only three fingers?

There are two primary muscle groups at work. The ones which control the 2 larger fingers, the 1st and 2nd phalanges (thumb and index) are controlled with the larger thenar muscles, called the flexor ...
Andrew Jay's user avatar
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10 votes
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Are Omoplatas legal in judo?

Yes, omoplatas are considered a variant of ashi-gatame or hiza-gatame.1 3 The IJF Referee Commission has confirmed their legality on multiple occasions,1 2 both as a submission, and as a turnover: ...
brazofuerte's user avatar
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10 votes
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What is this person talking about on the relationship between judo and BJJ?

The person is perfectly correct, except with the last sentence. I guess this is a semantical problem. You can say "X branched off from/of Y", which says X is a descendant of Y, or "X ...
Philip Klöcking's user avatar
9 votes
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Problems hip throwing a larger opponent

If you are 75 kg, then you should not have a problem throwing an opponent who is 102 kg with a basic hip throw. The major hip throw (ogoshi) is the first hip throw in the judo curriculum. It's ...
mattm's user avatar
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9 votes
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Apply Falling Technique in Real Situation

This probably should go without saying, but you will learn to do what you train to do. If you only train your ukemi as "If they use technique A, use breakfall B", you're probably not going to think of ...
Macaco Branco's user avatar
9 votes
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Sumi Gaeshi or Obi Tori Gaeshi?

I take Toshiro Daigo's book Kodokan Judo Throwing Techniques to be the official word on throw classification. Daigo is the chief instructor at the Kodokan, the mother school of judo in Tokyo, Japan. ...
mattm's user avatar
  • 14.4k
9 votes

How to deal with a judoka who is not gentle?

Judo has two basic principles Both principles are what makes Judo "gentle". The first one is the technical principle: seiryoku zen'yō (精力善用, maximum efficiency, minimum effort). This one ...
Philip Klöcking's user avatar
9 votes

Why grip with only three fingers?

The consensus of opinion on this, based on a brief survey of forums discussing it, is that the 3 finger grip is done for 2 reasons primarily: It reduces fatigue in the forearm muscles. If you're ...
Steve Weigand's user avatar
9 votes
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How has BJJ innovated since diverging from Judo?

I think it's important to make a distinction between "someone, somewhere in the Judo community has used this at some point" and "this is widely known and used in mainstream or competition Judo". There ...
Richard Metzler's user avatar
9 votes
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What did Judo change/innovate when it branched from Jujutsu?

Judo's initial innovations were not in techniques, but in the manner of training them. Randori Kano emphasized the use of randori (free practice) in training. This contrasted with many jujutsu ...
mattm's user avatar
  • 14.4k
9 votes
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Why is the pistol grip banned?

Judo competitions have a lot of rules, and these rules are tweaked for most Olympic cycles. A primary driver of rule modifications is to promote attacking for a positive score and discourage "...
mattm's user avatar
  • 14.4k
8 votes

Teaching ukemi to children

Teaching children in Judo for 13 years now and having made an instructor's license, I will try to pin it down to some principles (as concrete lessons may be established, but are dependent on the group)...
Philip Klöcking's user avatar
8 votes
Accepted

Fact check-- highest belt level for a 21 year old

Judo has rank requirements that include competition record, skills demonstration, time in rank, minimum age, service, etc. The specific requirements are dictated by a judoka's governing organization, ...
mattm's user avatar
  • 14.4k
8 votes
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Who said there are 3 paths of judo and where can I find the quote

Obviously, the sourcing is kind of messy, but considering Hal Sharp used to actually be in personal contact with this man, a video of his will have to suffice for validation. Yoshimi Osawa, 10th Dan, ...
Philip Klöcking's user avatar
8 votes
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Why were leg-locks removed from Judo?

Leg-locks were banned shortly after an 1899 exhibition match in Kyoto (held before Emperor Taishō) between Kodokan 3rd dan Yuji Hirooka and Fusen-ryū master Mataemon Tanabe. During the match Tanabe ...
brazofuerte's user avatar
  • 8,212
8 votes

Why is ude-garami legal if it is effectively a shoulder lock?

Original intent of rule The phrasing "kansetsu-waza applied to the elbow joint"b is used by the Kodokan to describe joint-locks which achieve their effect by: straightening or bending the ...
brazofuerte's user avatar
  • 8,212
8 votes

What is the good path to become a Judo teacher?

What rank to help teach? There is no minimum rank. The head instructor must have confidence in your abilities and have a need for assistance. In smaller clubs, you may be one of the most advanced ...
mattm's user avatar
  • 14.4k
8 votes
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What is kubi-nage?

Kubi-nage appears to have been coined by Mikinosuke Kawaishi, as the earliest references to judo throws by this name appear in his works.2 3 He describes it as a hip-throw with the arm wrapped around ...
brazofuerte's user avatar
  • 8,212
8 votes

How are chokes/strangles classified in Judo?

Below is a list of chokes and how they fall into the 12 current Kodokan shime-waza classifications. Note that like with certain throws, there is often debate as to whether certain choke applications ...
brazofuerte's user avatar
  • 8,212

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