The common trouble in using the voice for the more vigorous or intense
forms of speaking is a contraction or straining of the throat. This
impedes the free flow of voice, causing impaired tone, poor
enunciation, and unhealthy physical conditions. Students should,
therefore, be constantly warned against the least beginnings of this
fault. The earlier indications of it may not be observed, or the nature
of the trouble may not be known, by the untrained speaker.