The technique I learnt was at a 10-day silent retreat, of which we spent the first days (9-hours a day) exclusively on concentrating on respiration. With this new awareness, I realised, just in my day to day, and especially when I'm trying to focus, I sometimes forget to breathe. This is something I otherwise would not have noticed and not corrected. Also important to note that I used to have mild sleep apnoea, and I would always wake up feeling groggy from lack of oxygen. I haven't had a sleep study since I've started practicing, but I no longer wake up groggy, and now I can go to sleep within the hour instead of tossing and turning half the night.
I've noticed that yoga and meditation have also improved my breathing and form during exercise.