How do I perfect my circular breathing?

Update: I play the alto sax, and have tried to learn how to circular breath. I can currently hold out any middle range note indefinitely. When I get to the upper notes (usually when I get above the staff) I can no longer get the notes out. How do I strengthen my cheeks to be able to circular breath when changing notes and... show more I play the alto sax, and have tried to learn how to circular breath. I can currently hold out any middle range note indefinitely. When I get to the upper notes (usually when I get above the staff) I can no longer get the notes out. How do I strengthen my cheeks to be able to circular breath when changing notes and when playing higher and lower notes?
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