This is a neat little exercise to get you focussing on your air flow and air support. Regular use of this exercise will improve your sound and control.
The idea is to help you bring your air flow and release of it under control. Bowing 'against' the resistance will help you manage your air speed and support. When that resistance is then removed you'll find your sound is far richer and fuller across the range of your instrument. You can also find that the higher register feels more supported.
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