I just came across the following definition of the concept of the core at Spring Pilates and Yoga Studio in San Francisco.
What is the “core”?
You may have been hearing this buzz word for a while now, not completely sure what everyone is talking about. The core refers to a group of muscles and tissue around the crucial area of the lower trunk and hips. This group includes the lower spine, sacrum, pelvis, and femurs. Strengthening the muscles that attach to these areas, such as the abdominals, psoas, spinal erectors and gluteals are necessary to stabilize and control this “core” area. Since the core is the foundation of all movement (kind of like a starfish, where all movement radiates out from the center), any weakness, instability or dysfunction can cause minor to severe strain and discomfort throughout the entire body.
It is a better definition than most and provides a good place to begin. Look for further discussion soon!