Can you inhale and exhale at the same time?

Circular breathing is a special technique that musicians must master to play some wind instruments – such as the Australian didgeridoo or the oriental zurna. The method involves that the musician, towards the end of his exhalation, fills his cheeks with air and saves it as a reserve. Subsequently, he takes a new breath through his nose, as he continues to blow the stored reserve out through his mouth. In this way, the musician can hold a note for a very long time. The existing record was set in 2017 by a saxophonist from Nigeria, who continuously held the tone E for 51 minutes and 38 seconds. Music for modern wind instruments is usually composed in such a way that circular breathing is not absolutely necessary.