how to train core and reduce gut distention?

following the core video I have done a few days ago, this video is mostly related to abs and obliques. I talk about the importance of breathing rhythm during core exercises and how they can affect(good or bad) your gut shape and I talk about the transversus abdominis activation for better posture. that video included 3 exercises for the core which were involving lots of muscles but these three are more focused on ab muscles, especially rectus abdominis or six-pack.