I understand the problems that go along with being a german bow player and now I sit to get around them. While I think that there certainly is a method to standing and playing (Karr's,) I follow Simandl and standing was just not easy. This is really true once I started getting into much harder material. Time was also an issue. I love Gary Karr, but he is not playing in an ochestra for a four hour opera...thus he can stand with ease.
Playing sitting down freed up both hands and now I am able to work passages easier. You should be able to use your entire arm no matter what position you play in and overtime I think you'll find out that certain portions of the arms are better at certain actions and vital to performance. I prefer the folding chair that lemur sells since it is adjustable compared to a bar stool. When I play the bass is not like a cello position and play the E string with ease, try "kicking out your knee" so that the leg is not like a 90 degree angle, but more relaxed and lower to the ground.
About using the wrist alone: This may work for you current material, but just remember that it will not always. Eventually, depending on how advanced the material you study is, you will have to use the entire arm and know which sections need to be used for certain technique.
Playing sitting down freed up both hands and now I am able to work passages easier. You should be able to use your entire arm no matter what position you play in and overtime I think you'll find out that certain portions of the arms are better at certain actions and vital to performance. I prefer the folding chair that lemur sells since it is adjustable compared to a bar stool. When I play the bass is not like a cello position and play the E string with ease, try "kicking out your knee" so that the leg is not like a 90 degree angle, but more relaxed and lower to the ground.
About using the wrist alone: This may work for you current material, but just remember that it will not always. Eventually, depending on how advanced the material you study is, you will have to use the entire arm and know which sections need to be used for certain technique.