Keep equalized without tension in throat. Good respiration spreads work around all muscles. On an Incentive Spirometer or Breath Builder, Bring ball to top smoothly and gently. Start with maximum resistance and as you reduce it prolong time you keep ball at top. Inhale fully to a comfortably full level.
Maximal inhalation is used for emergency situations.
Your body can lie. For example you can move chest and abdominal region and not inhale. If you want to move tissue you can order body to do this-or you can order breath. Brass instrument is for resonance only. Player supplies vibration and air.