Volume

The leader must use enough volume for the group to be heard, often in large spaces with poor acoustics. This can be problematic for CR exercise leaders, who must be aware of the potential to damage their voices (Kennedy and Yoke, 2005). In addition, in a typical week CR exercise leaders can be teaching up to 10 hours (Thow, et al., 2004). There is an extra demand on the exercise leader if he/she is performing the exercise as well as teaching. There is an increased oxygen demand, which could cause the leader to develop laryngitis (Bernardi, et al., 2000). To minimise potential problems, the leader should use good lower torso diaphragmatic breathing. It is important to avoid voice strain by forcing tension on the throat and shoulder muscles. Exercise leaders should also take care not to instruct all the time but allow vocal pauses. In large spaces, where acoustics are poor, a voice microphone can be useful to reduce the need for the leader's voice to be used above music and the noise of exercise. A drawback of this method is the cost, insurance and upkeep of equipment. Alternatively, a whistle can be used to attract attention, or, in the case of circuits, to indicate a time change, rather than voice commands. The circuit mode of delivering the aerobic overload period uses the voice in a slightly less demanding way as the exercise leader does not need to communicate to the whole group for the entire session.

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