In order to do what we do, we have to not only be able to read copy effectively, but we have to keep our voices working!
I have a friend who makes a living in voiceover work with his whiskey and cigarette voice, but he is one of the exceptions to the rule. And he doesn’t do any long form work. Anything over a minute or so is pure torture to him.
The rest of us need to make sure we know how to breathe correctly and keep our vocal cords happy and healthy.
Here are some singing exercises that can help you in a lot of ways. This one talks about intentions and then analyzing the results. Using vocal fry to your advantage!