You know, it's hard to define it. Like me, if you are someone who did not stutter since you we're born, and you developed it, it's probably because something happened, and while the problem is mental, this still helps. Why I am saying this is because I got blocks. And sometimes, when I said what I wanted, and if someone does not hear it, and says if I can repeat, then it's an absolute block, I just cant. And doing this exercise, the muscles are stronger and stronger, and at the moment you would stutter normally, after doing this for a while, you don't. And the more and more you do it, the les and less blocks there is, and speaking normally, becames more normal than before.