When I started to teach classes I got sick in the throat somehow often, hoarse namely.
And recently when I attended the choir the conductor told us we had to sing from our stomach, as translated from Spanish.
The point I guess is we have to speak by using the diaphragm, by using our lungs. Teaching isn’t a matter of the throat but from deeper inside.
You may inspire before you say something to your students, just try a few times, kinda that. / Photo from: www unknown com