yeah thats what everyone tells me.. but when you practice them alot, there are techniques that you can do so that you do not have to use as much energy in it... And with enough practice, it comes really effortlessly
My La Campanella was fairly well... but then when i reached the part with the octaves in Hung #6, I shattered one of the bass notes (I dont remember which one, who would?) that i hit alot. When i mean "breaking" a string, i mean it sounded like a grenade expoding inside the piano!