Good tip. My theater coach in high school taught me another trick -- no cork needed. For (almost) every consonant of the alphabet, stress lips and recite that

Good tip. My theater coach in high school taught me another trick -- no cork needed. For (almost) every consonant of the alphabet, stress lips and recite that letter, e.g. for "m", "muh-muh-muh, muh-muh-muh, muh-muh-muh, muh-muh-muh, mah". (cadence needs to be fast but consistent) This does wonders to loosen things up around the lips, especially if you have "lazy" lips like I do. It can be surprisingly hard to do m's, n's and p's.