The use of the air stream is paramount in trumpet playing. Many trumpeters spend too much time thinking about their lips instead of their airflow. This simple exercise can help with the development of air stream technique and awareness. Take a full breath and blow air through your lead pipe.  Without the mouthpiece just put your lips around the lead pipe and blow.  Do this a number of times. Concentrate on taking full breaths before you blow and don’t hold the air in any time. Try doing this before your warm-up and throughout your practice session.