Why do we call it training?
Well Zen is about engagement with your self, your mind, and others. That's not a simple thing, and first it requires realization that you should, but then what do you do after that? That's the training part. Your ongoing engagement. You can sign up to the gym, but actually to live you need to exercise everyday even just a little. Imagine what would happen if you never left your chair or bed? There are soem people stuck like that for medical reasons - it's not good, you wouldn't want to live like that, and infact in worse cases it leads to organ complications and death, your mind is like that too. You have to exercise it and feed it the right way or you suffer. So this is why we call Zen training.
We don't think this is something you do for recreation, this is something you do so you minimize your suffering and other's in the world, and contribute to a better world.
If you want to make a better world, please start with yourself.
It's a long journey.
The world and yourself - take responsibility, has been conditioning you since you were born, you don't just shake that away without effort, fails, disappointments. You have to hang in and train. It's the most important thing in your life actually. If you don't it effects the relationships around you, some of that you can't even see, your work, your happiness and fulfillment
Of course it's not easy, like a stream that flows, the bed of the stream has rocks and sand in it. Your life is like that too, it has has disappointments and some times strongly deludes you about yourself even right now. So we call it training.
Gassho _/\_ (Compassion)