Growing up with piano, pianos generally seem to be about 29-30" from the floor and I sit on a standard piano bench (not adjustable) that's like 18".
When I sit - properly - with good posture - sit up straight! - my forearms are basically parallel to the floor.
When I slouch - which is all too often, my forearms basically angle up from the elbows to reach the keys.
With keyboard stand and standing to play keys (a single keyboard) it seems kind of odd to set them up to account for the difference in standing. The tops of my keys would be like 39.5 inches (like 1 meter) if I'm standing (I'm only 5'4" on a good day, though I usually play in dress shoes).
But usually the keys are on a lower stand - or I myself set them up so the X stand is wide, meaning more stable.
But obviously I'm "reaching down" to the keys.
I'm not playing speedy licks or virtuosic stuff, but I have noticed I'll spread my feet apart to lower my whole body while playing a lot of times, meaning I probably feel I need them higher.
Also when they're low like that I tend to bend over forward a little too, which starts to strain the back (which is also probably why I spread my feet because I'll stand more upright if I'm lower).
I realize this is all personal taste and everyone's body is different, but assuming your standing and not sitting, what kind of height do you feel comfortable playing - is it "bad" (posture, tendonitis, etc.) to play with it lower, or is it better than higher, pros/cons to each? (as a guitarist strapping the guitar high makes access to the higher frets easier, and barre chords in general easier, but lower looks cooler :-)
Also, what about higher and angled down - at what height do you feel it advantageous to angle it down?
Should one's wrists be straight?
I'm just curious about others' experiences with this.