I inhale positive energy and exhale my worries.

It's the only adjustment you can make in a meeting without anybody seeing it. Nobody notices a slower breath the way they would notice you leaving the room.

Worry does not leave the body on a schedule, and one breath will not clear a difficult afternoon. What it does is interrupt. It puts a gap between the thing that arrived and the version of you that answers it.

Three of them, taken before opening the message you have been dreading, take less time than finding a pen. It is the cheapest intervention available at a desk, and one of the very few that works while other people are still talking.