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I am thinking of perhaps learning Fantasie Impromptu soon. I have played a 4:3 polyrhythm before but not for longer than a measure. The piece in which I have encountered this polyrhythm is Nocturne Op. 9 no. 2. I am perfecting that nocturne(I commonly lose my place in the rallentando when I start at tempo and go up to trill speed).

I noticed that my hands, even though my right hand is the same width and depth and is only longer by a millimeter or 2(that slight asymmetry in the hands I found is due to handedness, my longer hand is my dominant hand), my right hand is more flexible(don't get me wrong, my left hand is pretty flexible too). This shows up clearly when I play arpeggios that have a 10th as the interval between the lowest and highest notes.

Take the first 2 arpeggios in Fantasie Impromptu for example. They stretch up to a 10th. I can't reach a 10th with static intervals at all in my left hand and I can rarely reach a 10th in my right hand as a static interval.

I can use a 1-2-4-5 fingering in my right hand for G#-D#-G#-B but for that same arpeggio in the left hand I have to use a 5-3-2-1 fingering(Both of these are with some rotation to reach the 10th without overstretching the ligaments). Only when the interval is a 9th or smaller can I use a 5-4-2-1 fingering in my left hand.

I don't know if I am going to get a growth spurt in my 20s or not(I know some people do get a growth spurt in their 20s). But I was wondering, would practicing Fantasie Impromptu, particularly those triplet arpeggios, increase my left hand flexibility, particularly between my 5th and 4th fingers?

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  • To repeat what I have said in answers to several of your other questions: you don't want "hand flexibility", you want wrist and arm freedom of movement. Waiting to see if you "might get a growth spurt" is just fantasy. Either you stop trying to play the piano like a harpsichord, or you stop trying to play 19th-century piano music - it's your call!
    – user19146
    Aug 10, 2018 at 18:29
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    If you really want to break out of the trap you have got into, practice the left hand using only your 3rd finger, for every note. When you can do that accurately and evenly (but not necessarily at full speed!) then go back to using a more sensible fingering, but don't "forget about" the wrist and arm movements you have just learned.
    – user19146
    Aug 10, 2018 at 18:33

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Streching one's hand in order to play the arpeggios you are reffering to would be higly detrimental.

A streched hand build up tension, and you want to be as relaxed as possible while playing. You wont be able to sustain such a stress for the duration of this piece, at best your musicality will suffer a great deal from it, and at worst you will injure yourself.

As alphazero pointed out in the comments, you should use arm and wrist movement instead, to maintain the hand as closed as possible when playing. So just use the fingering which is the most confortable for you.

To answer your question, yes I think repeatedly streching your hand will make it more flexible, but you dont need to be actualy playing the piano to do that. Stretching your hand in the air would to it too, i just don't think there is any point in doing that.

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