About a month ago me and my teacher decided to play only scales and Czerny. Is this good? Should I practice a piece also?What are good exercises/rythms for scales? To gain more fluidity and so on. I also have trouble with the ascension of the left hand. In ascension of right hand I can "arm walk," but when it is on the left my body blocks it and I have to move my hip. This tenses my right side.