The 10% Rule. Typically, when you present in front of groups or on camera, you need an extra 10% of expression, oomph, and volume. The latter, volume is your secret weapon to boosting your presence. Speaking up, just a bit louder, tends to increase your overall energy and expression which will make you a more dynamic speaker. Here’s an exercise from Lyle Mayer’s book: Fundamentals of Voice and Articulation. For more exercises and to purchase the book, click here.