This is my first post here, and I figured what better website to use to clear up a technique issue from a student's standpoint...My former piano teacher (K-12) told me a few years ago, when I was learning to play Rachmaninoff's Prelude in C# Minor, that during the 'sfff' part at the end of the piece (after the agitato section), that I should lift my whole arm (up to the shoulder) and drop it down to get the weight of my entire arm involved to produce that big of a sound. While performing this piece at a competition, one of the judges told me afterward that playing like that could cause future problems (i.e. carpel tunner, etc.).My question is: can somebody tell me who is right? I'm a confused college student and nobody is able to answer my question because it seems like everybody has their own ideas.