Core stability and core movement made their debut as key concepts of the training method devised my Joseph Pilates, who, as most physical therapists know, developed a series of movements to develop the human body. Core means the central or inner part, the essence or most important part of a matter. Stability means the capacity of an object to return to equilibrium or to its original position after being displaced. This article provides a brief introduction to the principles of core stability, with an emphasis on using foam rollers to facilitate these concepts in personal training and therapy programs.