Since starting on the grade 3 scales, I've noticed that with Eb & Bb majors, I instinctively invoke a marked rotation in my LH wrist when descending, such that my LH thumb (and fingers less so) are almost orthogonal to the keys.
I've tried to represent this in the diagrams below:
(1)initial LH position at top of scale. Red arrow shows rotation of hand
(2)LH descending, with wrist rotated
I don't seem to do the same large rotation with any other scales or arpeggios, and I think it originates from trying to manage getting the fourth finger on Ab or Eb (depending on scale) and the thumb under ready for the next note.
Although the above is instinctive, instinctively I also feel it is perhaps wrong (as it looks ungainly) and will cause problems in the long run. Is this conclusion right? Should I consciously try to to keep the hand parallel with the keys instead?
Edited by Ligneo Fistula, 04 December 2018 - 21:23 .