Someone's just asked a question about making your voice deep and I see the same question every now and then. Instead of having replies buried in a random topic, I'm making a thread that can be easily seen and linked to.
We're all aware that deep voice makes us manly, sexy, pleasant to hear etc (just listen to Hollywood sex symbols, CEOs and other 'Alpha males'). Many of us, unfortunately and for various reasons, tend to speak in softer voice (I've had the same problem), which feels unpleasant and emasculating. No wonder people keep thinking of it and asking for advice over and over.
I found this exercise almost by accident. At first I didn't even think of it as a way to deepen voice. Being a big fan of Elliott Hulse I was watching this video, the exercise looked interesting and I decided to give it a try. To my big surprise, after finishing, i noticed that my voice is much deeper and I wasn't even trying. After some time, by the end of the day it got back to the old softer tone (the whole time I wasn't trying to force anything) but I was now intrigued how come that only few minutes of exercising gave such a stunning results. I did it again and got the same result, not to even mention how I felt more relaxed, grounded (indeed) and more confident. I was hooked since then and was doing this little exercise whenever I felt like.
I can personally attest that after some time you get used to talking with deeper voice and now I even find it hard to purposely talk the old way. Do it enough times and it will have lasting effect. And confidence and grounding (if you're into bioenergetics) are there as well, you can just feel it.
IT'S NOT ABOUT VOICE, IT'S ABOUT BREATHING.
Here's the video: How To Breathe Into Your Balls Like A Boss (gotta love Elliott's terminology). The exercise starts around 4 minute mark, but watch the whole thing. Pay special attention at Elliott's voice at the begging and how it immediately gets deeper after the exercise, he even starts talking much slower (typical description of how alpha male talks: deep and slow). From what I've learned from Amy Cudy's famous Ted talk, i wouldn't be surprised that this also boosts testosterone levels, but that's just my wild guess.
Try it yourself, you won't be disappointed.