"Breath in through the nose. Out through the mouth."
Coincidentally I've read several books on HOW to practice Deep Breathing - there is a surprising number of variations on how many counts in, how long to hold the breath (if at all), and how TWICE THE COUNT on the exhale is important, and how we should work to wring out the last "stale breath" in the lungs (I've lost the link to that one).

Who shot that video for you?? The rising up and away, as if in a hot air balloon, watching you and your friend shrink, and the landscape expand, and the world enlarging - wow! Just, WOW!!!