Have the group split into two rows (A and B) facing each other. Give everybody in one row a set of sentences to say. For example, the first sentence could be: "I feel angry today." Give the second row another set of sentences that are slightly different from the first, such as: "I feel languid today." Each person in row A says his sentence followed by each in row B. After each exchange, the pair takes a step backward so the distance between them increases. If somebody raises a hand, it indicates that he has not heard the sentence clearly and needs it repeated.
Young children can practice simple voice projection techniques. Place three bean bags or teddy bears at separate distances in a room. For instance, the first object could be 10 feet away, the second 20 feet away and the third 30 feet away. Have the children introduce themselves to the first object, then the second and the third. Explain that they need to raise their voice slightly each time in order to be heard.
Tell your group that you will be telling a story together. Select a book for this exercise. Have the group sit together and ask one person to stand around 20 feet away and read a few lines from the story. If the group can hear all the words distinctly, then the storyteller can return to her place. If not, she repeats the lines and tries to project her voice. Each person in the group takes a turn at storytelling.
Take the group to a field or a large outside space. Give a megaphone to one person and choose another person who must project his voice. The rest of the group must stand 30 to 40 feet away. The person with the megaphone says something into it and then the second person repeats this, trying to match the volume. Each member of the group takes turns.