May one learn how to breathe from the diaphragm (Buddha Belly Breathing) holistically throughout all of their activities and if so how exactly?

Peace, Divine Love, and Blessings to All. I recently began to research meditative/breathing for the Solar Plexus. I was instructed that the "normal breathing" done in the west is not the right/true way that we are supposed to be breathing but instead we should do it from the diaphragm (liken unto babies). During my research, I came across Belly Breathing/Diaphragmatic Breathing which I came to find out is "Buddha Belly Breathing" (please forgive me if I come across as ignorant not knowing the true terminology and cultural linguistics). The very little I have done so far has been amazing but extremely difficult. Inhaling while expanding the stomach (and vice versa) took a lot of concentration while simultaneously trying to keep an erect posture with square shoulders (all while trying to be loose) was/is full of challenges. It made me consider and realize, one how bad my posture is (sad face) and two is it possible to continuously and consistently do this form of breathing throughout the entire day and in all activities? I understand that meditation is about going inwardly, so I know I must take that journey and do the inner work but I pose this question asking if there are people who have done it, are doing it, and would they kindly share any pointers or guidance about their accomplishment(s). This question is open to anyone. Feel free to share howsoever you are led to...Thank you. (As suggested this question was posed on the Hinduism StackExchange as well)