This total-body workout incorporates cardio, stretching and resistance to strengthen the core muscles (the muscle groups that girdle the waistline and back). Building a solid foundation with strong supporting muscles is the goal of this state-of-the-art workout. By strengthening your core, you'll be more prepared to tackle the resistance and cardio moves throughout this program, while reducing the chance of injury. You'll also improve your flexibility, balance and co-ordination - all vital to the success of your total-body development.