Before you start speaking, take a few deep breaths, expanding your abdomen and breathing out slowly as you relax and feel comfortable.
When speaking, breathe deeply and steadily. Breathe from the abdomen. Use the air you have to project your voice to the back of the room. Take deep breaths at points where meaningful pauses are appropriate.
Do not breathe too quickly or you may hyperventilate and become dizzy.
Sometimes it is actually good to breath faster, for example when you want to generate a sense of excitement.
A problem with speaking is that it requires breathing out. Breathing in can seem like a nuisance and some speakers gulp it in quickly and almost apologetically.
If you take deep breaths, you will be able to speak for longer before breathing in again. Your voice will also be more resonant and you will be able to project it better.
Singers must learn to breathe properly as they cannot break mid-note without ruining the song. They know where to pause and how to taking in enough air for the long notes without seeming to break their stride.
Hyperventilation reduces carbon dioxide in the blood as more is being breathed out. This makes the blood more alkaline, constricting blood vessels and so reducing oxygen to the brain.
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