A correctly delivered command will be understood by everyone in the class. Correct commands have a tone, cadence, and snap that demand willing, correct, and immediate response from students.
The loudness of a command is adjusted to the number of students in the class. It is necessary for the voice to have carrying power, but excessive exertion is unnecessary and harmful. A typical result of trying too hard is the almost unconscious tightening of the neck muscles to force sound out. This produces strain, hoarseness, sore throat, and worst of all, indistinct and jumbled sounds instead of clear commands. Ease is achieved through good posture, proper breathing, correct adjustment of throat and mouth muscles, and confidence.