Katrina's blowing pressure test (experiment #0)
Anna administers our blowing pressure test to Katrina, who makes a strong initial effort even though she is only beginning to "find" the muscles involved in expiration. Similarly, during the "cheeks in" portion of the test, it takes her a bit of effort to overcome her natural tendency to inflate her cheeks when blowing. She is quite relieved when she learns that the rest of our experiments leave her free to blow in the way she find most effective.
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