Core X System Basic Package Includes a Core X Integrator with arm and leg attachments, lower body intensifier, diet and nutritional plan, quick start guide, high intensity workout DVD and a Core X travel bag. The Core X System works by increasing overall trunk muscle recruitment. Increases proprioceptive stimulus and assists in establishing the core neutral posture. Same workout system used by professional athletes like Steve Nash, Pau Gasol, Grant Hill and Michelle Kwan. Portable system can be used anywhere. Used by Professional Athletes in all sports around the world!