If all you do is tighten your abs, that is not the core. It is a common belief, but an incomplete one. In Pilates, the core is not a single muscle nor a constant state of tension. For Joseph Pilates, the center of the body was an organized system that allowed efficient, controlled movement. He referred to it as the Powerhouse, the origin of all movement. The core in Pilates In the Pilates Method, the core is a coordinated system that includes the deep abdominal muscles, the l