I'm not in disagreement with Doug's statement...or at least I think so. You can treat a specific problem in your playing, that it may refer to a specific use of any given anatomic part of the system, but it is likely to alter sympatheticaly other variables. Hopefully without hi-jacking this thread I'm going to post a video of Thomas Stevens speaking about Schlossberg trumpet teachings...It was interesting to hear that he would only give exercises that treat students weaknesses/liabilities and would not even touch on things that are workong well.
For me personally all information is great to have. One can try out wat works and what not.