Seeker That exercise is part of my daily practice, but I do a more difficult version of it. I use A for the thumbs of both hands and do a natural minor scale, AND I do both hands together. It's considerably more difficult that way. "Pro tip" - sit back, use your peripheral vision when possible to keep the entire section of the keyboard in which you are working at the same time. You can try that with the skipping stone exercise as well, and that one is more difficult yet, at least for me, particularly as I move out to the edges of the keyboard. I finish up with the leaps at the end of the 2d movement of the Schumann Fantasy. Enjoy.
I was wondering if you would have a word or two to say about this given what I was practising. Delightful to read your take. 🙂 I loved reading about the variants you have invented such as A nat minor. Feuchtwanger does talk about experimenting, I think, as all excellent instructors do.
For the rest, I'll send a PM.