Probably the simplest agility exercise is a five note scale 123454321 (Do re mi fa sol fa mi re do). After you have done some session 1 exercises (most agility exercises are better used in session 2) try singing this pattern in the middle voice on an “ah” vowel. Move quickly but not so fast that the notes get sloppy. Move up and down the middle voice using the exercise on different vowels. As you approach the passaggio allow the vowel to modify to whatever works best. If a certain vowel is not working well, try a different one.
Try setting the exercise to a metronome. Gradually work faster and faster, working for the same evenness and clarity from note to note.
You can easily extend this exercise a couple of different ways. Try starting on scale degree 5 (sol) and descending first: 5432123454321 (Sol fa mi re do re mi fa sol fa mi re do). Again experiment with different vowels as you move throughout the range.
You can also try the exercise two or three times in a row using different vowels each time: start with [i] (“ee”) and sing 123454321 then move immediately to [e] (“ay”) for 123454321 and then to [a] “ah” for 123454321. Work for the same evenness from note to note and gradually increase the tempo.
Another one I like to incorporate is even shorter, though not necessarily easier. Choose a vowel and sing the pattern 121232321 (Do re do re mi re mi re do). Again, try it on different vowels and at increasing speeds. You can string this pattern together with the first pattern: 12123232-123454321.
Why are agility exercises important? We all want a bigger sound (in coming to lessons, many singers have two main goals: to sing higher and to sing louder). The result is the tendency to sing too heavily or with too much weight in the voice. Physically this means that we use more mass of the vocal folds when we sing.
To sing fast agility patterns (and to sing higher) we need to use a lighter balance that encourages the edges or outer layer of the vocal folds to handle most of the vibration. Then the voice doesn’t get bogged down with too much pressure and the result is better flexibility and range. Often, if the voice can’t move quickly it’s because we’re just singing with too much weight. Finding how the voice can move faster through agility exercises builds the balance of pressure that will allow us to access more of our full range and will gradually develop into greater dynamic control as well.
Move the voice!
Now go practice.