May I be so bold as to say that anyone who doesn't already know how to warm up also isn't going to be performing technical flights of fancy like Chopin Etudes.
So the goal generally isn't a physical warm-up towards performing some physical task. The goal should be to get the neurons ready for situations they might come upon when you get past the warm-up and into the practicing stage. Scales, chords and arpeggios are the best vehicles for this. That sounds simplistic but don't worry... I'd be happy to contradict myself later.
Two points for now:
1) Try to explore the polarities of a) knowing a structure (scale, chord or arpeggio) really well in your brain, then using it to practice good tone and technique/efficient movement and b) not knowing a structure very well in your brain and merely worrying about putting the notes in the right order. A good warm-up session will traverse the ends of this scale.
2) There is no sense in repeating something unless you have a clear idea of what you want to achieve. e.g. "let's do that again" is useless, where "let's do that again but slower so I don't forget to switch to finger 4 in the left hand" is a perfect way to repeat a pattern.
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