Forget trying to develop the muscles of your throat. You can ruin your voice that way. In fact, the less attention you pay to your throat, the better off you'll be. The best "exercise" for the throat is to yawn a lot and keep it relaxed. Yawning also relaxes your jaw.

Alice has the skinny on all this. Heed what she says and check the links she posted. Good stuff!

Don Firth