Fudoshin is the Japanese word that means immovable heart, it also has an underlying meaning of imperturbability, having a calm that can't be broken by circumstances. Having courage without recklessness. I took the meaning from a website I found http://www.mainemartialarts.com by a practitioner John Moore.
I wanted to better explain the meaning without sounding confused and go from there.
Of course, with studying Bujikan, any practitioner knows that he or she is going to feel pain. It cannot be avoided. Whether you are new to this particular art or study for 20 years, I think the pain is the same. You must have fudoshin. If you don't you won't learn as well. Many of us who train have to learn to put our fear aside and be the best uke we could be. Make your stance count, make your punches count, punch with attitude, though it must be controlled.
One of the things I learn every single time sensei uses me for uke is I'm very aware of how my stance looks and that I am not bobbing, I'm keeping my stance level when I step up to punch him. Then what ever technique he is working on with us, I have to consciously breath out and relax myself. Let him do what he is going to do, so the other students can see what it is supposed to look like. I'm slowly learning the fudoshin part of it. I have to tell myself not to be afraid, even after all this time I am still hesitant when it comes to fudoshin. I am doing other things like meditating now to make my fudoshin stronger and it is helping.
I do notice when I go into class now, I am not bothered by the impending pain I'm going to feel, I am however very glad when we are drilling things one after the other.
The Japanese practiced their art daily. They perfect each thing they do and in order to do that you have to do it over and over. We, as people always look for the easy way out of things. Convenience. I feel that because of getting used to having things a certain way we have become a soft, predictable people. We do not practice Fudoshin. You don't have to have this heart and practice martial arts, you can have this attitude in whatever you do. When you are in school studying for a test, when you do your homework, when you are on a baseball team and you are up to bat. This fudoshin takes time to procure and to apply to your life. I know that it makes life easier to handle, even when things go wrong.
It is a warrior way of being..