I got way into eastern spirituality in my 20's, taoism especially. Not a religion, more like a way of life.

Taoists believe that the spirit and the body connect through breathing because it is both a involuntary and voluntary action at the same time.

Now that you're thinking about it, you're probably personally controlling your breath, where before you clicked into this comment section it was just happening naturally.

I read several books, starting with one written by a Westerner and the later ones that were over a millenia old. All focused on all sorts breathing exercises.

Even during love making, controlled measured breathing. Centering yourself, focusing your attention/sensory tools inwards rather than the outside world.

From my limited experience, I'd say if you're having issues with focus it is a great tool to have.

If you want some book recommendations I can give them, just ask. I don't want people to think I'm here to market anything.