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Rishinjuku karate is based in tradition, taking the old kata Naihanchi and deriving from it the almost forgotten principles of Muchimi and Chinkuchi.
Although based in tradition, it is a martial art with its priority being logic and practicality. Whether it is real life situations where you need to defend yourself or the ring, Rishinjuku karate works.
The techniques and principles can be learned even by children. It is all about understanding the correct usage of the body and seeing real life results.
Join the Rinshinjuku family. We are looking for enthusiasts who want to learn and spread this great art so that more people can find peace of mind and confidence.

Contact us if you want to find out more about the techniques or if you would
like to join the Rishinjuku family.

The mission

The mission: teaching the forgotten Muchimi for a better world

True confidence, the belief in yourself, is a rare thing. It will make your life in all aspects better.
You won’t be victimized by predators. Bullies will not target you.
Your job, love life, friendships… will all benefit.

You can’t learn confidence!

  • But you can learn:
    • How to move better
    • Self defense skills
    • How to protect yourself and your loved ones.


  • The fastest way to learn :
    • better movement
    • KO power for self defense
    • resulting in confidence

The confidence that you and people around you are safer. All while becoming calmer, because you will not overreact anymore. 

Muchimi, for better people, for a better world.

To learn more take a look at the Muchimi section of our site.


Shihan Murai

Born in 1969 in Osaka
Started to learn Okinawan Karate in elementary school

In 1985, after entering the dojo of Kyokushin Kaikan Karate headquarters in Osaka, he started training at the Shidokan.

He won the 6th All-Japan Seidokaikan student championship series and e won the first amateur Shootboxing tournament.

In 1987, he transferred to the Shidokan general headquarters. He won the 8th Shidokan All-Japan Karatedo Championship Series.
He won 7 of his 7 kickboxing fights (4 KO).  He was ranked number 2 featherweight in the Japan’s Martial Arts Kickboxing Federation.

In 2002, at the age of 33, he returned to the world of martial arts and founded

More information about Shihan Murai and the origins of Rishinjuku


Your fist, elbow, knee, shin, foot are like rocks. They do the damage, but are not the power source. So where does the power come from? Certain marital arts develop power through rotation, double hip, or pushing off their back leg (good luck on mud or snow using that). But the fastest and most powerful one is by using Muchimi.

Once you know how to use it, all your physical performances will increase.

What is it?

Muchimi is using muscles and fascia (connective tissue) of the body like a whip, or a rubber band. It is the best way to develop power in all strikes. It is based on human anatomy. Muchimi is recently known in the west as muscles slings.

It is often said that knockout power can’t be taught. But it can!

Muchimi explained as rubber bands

Imagine pulling the rubber band, then letting it go. Snap!
Now tie a stone at the end of the rubber band. Pull it back and let it go. Snap, into somebody’s head. Splat!

That is the image that you need to punch and kick really hard.
You have diagonal ‘rubber bands’ in your body going from your shoulder to your opposite hip/leg.

Imagine a rubber bicycle diagonally from your shoulder to your opposite hip.
(These rubber bands are actually muscles and fascia that form a unit, but that will be explained in detail in training.)
When you pull with your hip, you can snap your opposite shoulder with a fist or elbow into the target.

When you pull with your shoulder, you can snap your opposite hip with a kick or a knee into your opponent.
You have two such slings looping diagonally. Thus creating the image of an X
on both the front and the back.


Straight Punch

Hook Punch

Roundhouse Kick