Internal Power and Bujinkan Training

The other night I had the pleasure of having dinner with 2 of my oldest and best buyu, Josh Sager and Joe Lau.  We hadn’t had the opportunity to get together in a while so after catching up on what was going on in all our lives, naturally the conversation turned to training.

As usual, I was chomping at the bit to share with my 2 training brothers what I was working on in my own personal practice regarding internal power and how it relates to Bujinkan practice.  I won’t repeat the training conversation verbatim, but suffice it to say both my buddies were a little skeptical about what I had to say regarding Internal Power (IP) and it’s usefulness within the context of Bujinkan training.  And, while they trust me based on the length of our relationship and our shared adversity of training together for 20 years, I realized that many more people might be as skeptical of this type of training or even downright incredulous.  Therefore I decided to write this blog post to gauge the interest of my readership and how accepting you might be of internal power training and my interpretation of its role within Bujinkan training.

What is Internal Power?

I think it’s best to start with the basics.  What is internal power and how can it useful to the practitioner of Bujinkan Budo Taijutsu?  Let me state this at the outset to hopefully clear up a rather unfortunate misinterpretation of IP.  Internal Power is physical.  It’s not some mystical mumbo jumbo or a throwing chi balls type of nonsense.  It is a way of conditioning the body through specific solo training exercises and paired partner training. The training method spans thousands of years and has been handed down through the ages within the warrior traditions of India, China, and Japan.  It is a body technology with a set method and detailed process of instruction that simply cannot be learned by osmosis.  It must be explicitly taught.


The basis for the method is what is known as the union of opposites or In Yo Ho, in Japanese.  By creating opposing forces within the body (up/down, left/right, front/back) through the use of intent we begin to increase the mind-body connection to a remarkable degree.  Through the solo training exercises we condition and strengthen the entire fascia network, as well as tendons and ligaments, throughout the body.  This process serves to create a connected body through the center so that when ‘one thing move, everything moves’.

The Ultimate Ukemi

Internal Power training changes the way outside forces act on the body.  The structure becomes dynamically stable so that applied force can either be distributed throughout the chain and dissipated or, at a higher level, simply reflected right back onto the opponent.  When force is reflected back this is what is known in Japanese as Yamabiko, or Mountain Echo.

At first blush it may sound like a party trick, but the budo applications are quite staggering.  Think about it.  How does every martial art technique work?  What is the first thing you are taught to do prior to applying a technique?  Break the opponent’s balance, right?  Get kuzushi.  What if no one can compromise your structure?  What does that do to every throw, lock, and take down applied to you?  Yeh.  You’re getting it now, aren’t’ you?

And that’s just the beginning.

Every time you move you are completely and dynamically stable, balanced.  You gain the ability to hit like a truck using the full mass of a connected body without dedicating your weight.  Remember – when one thing moves, everything moves.  This becomes very profound, especially when you start to incorporate weapons.  And, since you are connected through the middle of your body due to the specific solo training exercises, you will finally and probably for the first time, actually be moving from center, hara, or dantien.

Sound interesting?

I would highly recommend checking out a Dan Harden seminar.  You can find his website and seminar calendar HERE.  Also, for you local guys – Dan will be here in NJ in March!

I am also more than happy to share what I know about internal power training, especially in how it can be integrated into Bujinkan Budo Taijutsu practice.  I teach it in my weekly classes and seminars upon request.


Jon Haas is a certified Underground Strength Coach and has been involved in the martial arts for over 30 years. He has been training in the Budō Taijutsu arts of the Bujinkan for more than 22 years and is currently ranked as a Kudan (9th degree black belt) under Jack Hoban Shidōshi.
Jon is the Head Strength & Conditioning Coach for VX Global and is a certified VX Sport Coach.

He is the owner and founder of Warrior Fitness Training Systems and author of the book, Warrior Fitness: Conditioning for Martial Arts.

Jon Haas is also a certified conflict resolutions specialist through Resolution Group International (RGI)

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  1. You have my attention. :)

  2. Excellent. Stay tuned! :)

  3. Yep, definitely sparked some interest.


  1. […] various forms of budo and other esoteric types of training.  As I said in my previous article, Internal Power and Bujinkan Training, the methodology is clearly laid out and organized to quickly initiate the practitioner onto the […]

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