Why I continue to count numbers in a bath? A fun and easy retention training as well as fluency and pronunciation

I go on enjoying counting numbers in a bath.

I find a few things while counting and when I see myself counting aloud after taking a video (in front of my laptop.)

The other days counting numbers aloud is a good fluency and pronunciation training.
Today I realized that it's also a good retention training. For the retention training purpose, counting numbers one by one around many thousands would be a good exercise.

When I learned listening English, retention is important, and I heard that many interpreters do retention trainings. Retention training is remembering what you've just heard for a while to understand the whole sentence or the phrase in the context.

So far I have adopted a few retention trainings. Sometimes I tried shadowing. It looked like to work pretty well, but only as long as spoken English is easy. Sometimes I tried dictation. To be honest, it was so difficult that I gave up after a short while. It took as long as 10 minutes for me to transcribe a 1-minute news passage of a news podcast.

There is another surprising thing I've found about myself counting numbers in English.
Simply counting (down) numbers one by one can be an exciting game.
There may be, (and should be considering eyes of the public) no one to watch me, and no one to judge me, but I usually know clearly if I counted (pronounced and spoke out clearly and fluently) a certain range of numbers very well. In a sense, I get a clear results internally, which motivates me unexpectedly much.