When I was 10, I discovered I was doing that without even thinking about it. That's when I understood why I could read at the speed I did. I kept doing it until my mid 20's, when I had my first burnout. Crazily enough, when that landed, I lost the ability to read. What
WigglyWorld84 wants to train, was happening in real-time. I can assure you it isn't fun at all.
Took me 3 months of forced rest, and I mean "forced", with strong meds that didn't knock me out but made me virtually paralyzed for 6 hours. My ex-wife, was such a generous person that doubled my meds, because if one was good, two was better, I still don't know why she stopped at two. Yeah, that's one of the reasons she became the Ex (from Hell).
So, let's say, I know what both of you are talking about. Closely. After the burnout I couldn't recover that speed reading. Tried and tried, but something was gone, along with the ability to code and drawing. The drawing part came back later, but completely different and not for the better.
This was but the first of 5 earthquakes that wrecked me. Now, you guys have to deal with these tsunamis of text while I try to put some meaning into words. As if.
Peace