Institutio Oratoria

There is, however, good reason for the rule prescribed by all authorities, that the voice should not be overstrained in the years of transition between boyhood and manhood, since at that period it is naturally weak, not, I think, on account of heat, as some allege (for there

For this reason the nostrils and the breast swell at this stage, and all the organs develop new growth, with the result that they are tender and liable to injury. However, to return to the point, the best and most realistic form of exercise for the voice, once it has become firm and set, is, in my opinion, the practice of speaking daily just as we plead in the courts. For thus, not merely do the voice and lungs gain in strength, but we acquire a becoming deportment of the body and develop grace of movement suited to our style of speaking.