I sort of feel like this isn't the best place to discuss what I'm actually thinking about in terms of my "real work" that I supposedly do as an engineering researcher.
(Much like I've offloaded my LaTeX writing, such that it is, to another place.)
So if you would like to know what I think about things like forces between magnets, elliptic integrals, sports engineering, robotics, noise and vibration control, and so on, consider taking a look here in the future.
I've always thought that frequent writing helps keep my brain in tune although I'm not great at keeping up with it. Being able to focus into different areas helps a little, I think.