Good luck!
Why do you think so? I'm not saying one has to PLAY trills ONLY in the way I described. It's just an exercise for the relaxation of the arm while playing trills. I often watched people trying to play trills only with their fingers while keeping the rest of the arm stiff, cut off from the movement of the fingers - which is terribly wrong and unnatural. The recommended exercise is meant to show a way to playing trills which begins in the shoulder joint and ENDS in the fingertips.
Trills, Ornaments - what exercises do you use (if any), and how do you train to use fingers 3-4-5?
The reason one finds the need to use these fingers is generally that the more preferred ones are required for other purposes at the time. And it is that use which restricts the ability to use the arm much (as arm movements affect all the fingers).
But I insist: It's necessary to apply weight and momentum of the arm when playing trills, especially with 4-5 because these are the weakest fingers.
Beginners experience problems with 4-5 in situations that are not as difficult as a trill or ornament.. so you start there, by helping fix those coordination problems.. which I find are usually in part caused by the student failing to position the hand/arm appropriately (poor balance over those fingers).
Better would be to do more pieces that fully use all the fingers. This will develop the independence that is lacking. It will surprise no-one here that I recommend Bach for that purpose.
I totally agree there. The difficulties in playing trills have to be approached beginning with the arm, not the fingers.
Trills, Ornaments - what exercises do you use (if any), and how do you train to use fingers 3-4-5? Personally I avoid using those fingers but have never trained myself (or students) to use 3-4-5, how do you do it? My sense is that it is not a matter of strength, but co-ordination, never the less they have remained weak and I always avoid using then. 1 or 2 plus 3-4 or 5 is not a problem...I'm guessing others have this issue, and with students, how did you train yourself/students to over come this?