Another important aspect to getting a good sound is posture. Whenever you sit down to play, you should be able to stand right back up. This means that your legs should not be crossed, underneath your chair, or sprawled out in front of you. Your back should also be straight and not touching the back of the chair. These two suggestions help you to get the maximum amount of air into your lungs and they also help to minimize the restriction of your air flow. Many players like to stand whenever they play because they claim it provides better support for their air and they are right. Just remember that whenever you stand, keep your back striaght, raise your rib cage, and keep your shoulders relaxed whenever you play. On T.V., you might have seen players that arch their backs when they play. I would suggest that you not do that because while it may look cool, it restricts the flow of air. Overall, the key to having perfect posture and to holding your horn right is to try and stick to these suggestions as close as possible and making changes only to be comfortable.