Very important video. When you hurt yourself seriously, it never really heals, even 1year after. I even didn't hurt my hand with some Chopin or Liszt, but with a Scarlatti sonata with some big strechs. I have small hands. Now I have to avoid pieces with too much large chords and strechs. I did too much for a time, not enough breaks/rest, and now it's not like it used to be for me. Even after a ton of physiologist sessions, my hand still hurts even if I'm very careful.
relaxation is so hard... in pieces like Schubert's impromptus (eg no2 in Eb), I always feel like I have to keep going and I just keep accumulating tension. I think it's a common problem and the advice is usually "relax after each triplet/bar"... however, I feel like this causes the phrasing to break up. how should one practice relaxation while maintaining phrasing, especially for very long phrases?
Just a stupid answer : I you play as much as relaxed as you can but you still feel too much tension, play the piece slower. It's not worth it, I've been there.