Of course, we need to understand the importance of each exercise. Like us, they are unique, as well as having many possibilities for variation!
The Three or Five Tone Exercise can be different, with changes in vowel, consonant, rhythm, and dynamics. These differences cause the exercise to be varied in the ways it can be used, as it will focus on and address the student's specific growth needs.
With that said, generally, if the three or five tone exercise is used with an even rhythm up and down, step by step with no jumps or leaps, then there is an incremental increase of muscular tension on the way up and a controlled decrease on the way down. Think of it like doing a slow bicep curl up and down.
Basically, this exercise is good at building muscle, and this is a large part of its intrinsic value, if done with proper adjustments!