Many years ago I lived in Tokyo for a few years. I used to ride my bicylce over the the private university (can't remember the name, but it's the one the royal family young men attend), . . anyway . . they had a stable and a riding arena, and I would watch them riding for hours. I remembered the years that I used to ride as a child..
Once, I was up near Karuizawa and met a young man who let me ride his horse for a bit. He was surprised that I knew how to ride much more than he expected.
Now I am living back in the USA. After raising two children, I started back to horse riding, and have been riding for the last 20 years. Once you start, it's hard to give it up.
We went back to Tokyo last October and had a wonderful 2 week vacation. I love Japan deeply.