No doubt you have heard the term "core" tossed about they gym. You know it's deep, but you have some core questions. Core question - What is it? The Core is a group of muscles made up of: The tranversus abdominis (don’t be intimidated by the Latin) a.k.a the deep abdominal muscle that wraps around your torso. It is the deepest of the abs, and it acts like a natural weight-lifting belt. Read more