As a long time martial artist, but a new shooter. I have been thinking about my breath a lot lately. At this stage I am not able to add speed, as I am still learning to control the trigger. I find that when I slowly exhale during the shot I can usually keep my trigger press smooth, and keep my sights aligned properly.
Hopefully I will be able to start adding speed in soon, and I don't see how I will be able to exhale over multiple shots. In the normal learning process does one stop needing to control the breath so closely, or do most people not need that close of a breath control to start with?