When I am explaining breathing techniques to students, I like to show diagrams and work with the physical side of the breathing, particularly for singing. During this time, in addition to encouraging the students to do some form of exercise such as swimming, I use a blown up balloon to further explain. I pull the neck of the balloon explaining the sound it makes represents the fundamental sound at the vocal fold area, and that the body of the balloon, which remains firm as the air escapes through the neck, represents their upper abdominal area. This is to encourage them not to release the tension straight away. I also release the tension at the neck of the balloon and the sound this time represents a breathy voice as the end result. I have had a lot of success with this visual tool, but the only thing I have to watch, particularly with the younger students, that they don't try and keep the muscles too stiff causing further tension at the larynx level. Another one I use is stretching a wide piece of elastic. This is to demonstrate how the brain helps control the extrinsic muscles as the elastic is allowed to retract slowly. This demonstration has also worked very well.
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