Masterclass Handout
Posture

Posture is important for everyone. Stand or sit upright, but not stiff. Make sure the lungs have freedom. Do not let your arms rest on the sides of the chest. Avoid letting the rib cage fall excessively as the air is expelled, thus allowing a quicker and more relaxed inhalation of the next breath, since the breath energy does not have to help lift it again. Note your shoulders. When you let them hang, do they roll forward? If so, you are probably stooping in the chest area. Avoid unusual head tilting or poking forward with the chin/neck. Posture is also directly related to body resonance, an important part of producing a full, vibrant sound on the insturment. 

Observe athletes, especially track and field. They usually have excellent posture. (Curiously, although I am a great fan of the sport, I cannot generally recommend baseball players as examples of good posture.) There are many good methods and books on posture, and most any sensible, natural posture will apply to playing the trombone.