I just finished a chapter around the quality and style of your voice from 10 Simple Secrets of the World’s Greatest Business Communicators. At the end of the chapter Carmine Gallo gives some toung twisters for you to say out loud to help you improve your pronounciation.
Doing the exercise just once without recording myself proved to be helpful.
Here are two of the tounge twisters from the book:
A big black bug bit a big black bear, made the big black bear bleed blood. A big black bug bit a big black bear. Where’s the big black bear the big black bug bit?
Peter Piper picked a peck of pickled pepper; A peck of pickled pepper Peter Piper picked. If Peter Piper picked a peck of pickled pepper, Where’s the peck of pickled pepper Peter Piper picked?
You can find some more over at SPEAK EASY: Master these tounge twisters.