We all know that gravelly, throaty, croaky kind of voice; it’s like the rep has turned into bacon sizzling in a pan. It's called “vocal fry.” Many people start a sentence strong with a deep breath and think they’re good to go. But then as they keep talking to finish their point, they run out of air and trail off, frying out the end of the sentence. Then they take another breath and start the next sentence, but again, they trail off and become croaky. If you do this, the impression you leave might be disinterest or even that you have doubts about what you’re saying. None of the implications are very good.
If you're sitting or standing without the best posture, you won’t breathe from the diaphragm to get enough air. Make sure you have good posture so that you can inhale completely; then open your throat and use a nice, full stream of air coming across your vocal cords. Be consistent from the beginning to the end of your sentence so it sounds like the whole sentence matters—not just the first half.