JD, if anything is unclear, Post or PM me. Body use is critical in martial arts too. You have a stance (I am not sure what it is called) where the feet are parallel and about shoulders width apart. This is a position where it is tough to knock you down. This is also good for trumpet playing as if the spine is reasonably straight, you do not need much energy to stand up, the body balances itself. Draw a circle on a big piece of paper and breath that way - inhale up the left side and down the right. Try and keep it relaxed and smooth, 10 second inhale and 10 second exhale. The transition from one state to the next is critical - no pressure to start "pushing" the air out! Just let the air flow by itself. Try and empty your lungs as much as possible without "force". If you hold air in with your martial arts exercizes, try and maintain a "yawn" and use your diaphragm to keep the air in. I am really serious about 1/3rd of your practice time on repertory or tunes. If you do not have much sheet music, download or get a Hymnbook and go for it.