I made up this little exercise yesterday for Lucas, a sophomore acting major. We found this surprisingly difficult, especially to nail the 3rd accurately every time we came back to it. This exercise was intended for early in the lesson, since it calls for masky resonance and quick, loosen-it-up agility. Sing this on /ma/ on every syllable, at about 100 clicks per minute. Once you sing a set on the first measure, lengthen and extend by singing the second and third measures.