Very useful technique to incorporate into daily playing...
Where to start?
I'll just leave an example from rehearsal today, showcasing a perfect occasion for circular breathing.
Starting on a high concert Bb, with a long line of sustained FF bell-tones... No space for breaking the line...
From the "Joyous" coda of Jessica Meyer's Press On
https://youtube.com/shorts/4k0WfH-WPNg?feature=share