I never thought Hanon was all that physically harmful (boring, yes.)
teresa_b, Of course these pieces are difficult for me! That is in part why I was given them! Surely though, I don’t expect to have them incorporated for some time, and the Chopin etude, if I were to have kept on studying it, I wouldn’t have gotten the whole thing with both hands on a moderate speed in less than 4-5 months I believe (perhaps more).
Conservation of energy, such an important aspect of playing piano well and too many disciples of piano do waste energy. When you are playing etudes for example you are forced to find this "effortless" touch on the keyboard otherwise you will find yourself unable to produce the desired sound and feel in control with the technical movements at the same time. This is not to say that all professionals of the keyboard play with an effortless touch, there are many who waste energy but through their practice have learnt to deal with it (such as increasing muscular endurance). This I believe is a danger we must avoid. When we produce a technical movement which is suboptimal, with enough practice you get use to playing this way and thus you learn to deal with and control the discomfort. In my opinion this is a wrong way to go about improving your technique even though many many do this.You must have a simple binary understanding of your playing, that is, is it optimal or is it suboptimal. You know what is suboptimal because you can observe the stress you body goes through. Those that study piano will constantly monitor this stress and learn to change their method to act against it. We must feel the subtle difference and actively know how to change our physical movements to draw us closer to the effortless touch to produce our music.This is all generalisations which do not mean much until you attempt to apply them. There is no use to discuss the applications of determining your optimal technical method because the exact stages and context is different for each person. What is however common to all of us searching for the optimal way to play our music is the ability to observe what our body is feeling when playing the piano and actively knowing if the changes we make to our technique improves or hinders our search for the effortless touch. This requires a good coach or an individual who is interested to experiment, observe, predict, infer, be like an investigating scientist, to get to know your own two hands as best you can.