The core muscles - abdominal to back and hips, pelvic floor to diaphragm - provide the infrastructure for every movement of the body. Using the Soft Gym Overball to enhance the core-strengthening benefits of your fitness regimen can promote better overall results in every area of the body you want to tone. For defined abdominals, a stronger upper body, and toned arms and legs, the exercises included in this book begin with strengthening and core muscles and the results will radiate outward.