I've read some basics on this, around 2006, but it's hard to think of more to say than "let most of the force in your breath come from lower." I do find that sitting up straight or standing is much better for this than slouching or lying down, etc. I generally do voicework standing (I only do the minimum for my own projects; I'm not much of an actor). It's the same breathing principals for playing a wind instrument, a lot of martial arts, meditation, etc. (The latter just focuses on breathing without the forceful projection, but the principal of controlling the breath with muscles lower than your throat and upper chest remains the same.)
@cae_jones, the technique you are referring to here is technically known as 'Diaphragm Breathing.' It is very effective and good both actively and passively, and used in voice training for stage, singing, and a variety of martial arts and meditative schools. It will also become second nature very quickly when practiced, and is the single best technique to know the existence of, which is why I taught it at the first rationality minicamp and the first boot camp.
Here is the technique, in brief form. YMMV.
Take a deep breath, placing one hand on your chest an...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.