Fitness Ball is a tool that is widely used in fitness, stretching, rehabilitation, and even labor. It was originally created as a piece of equipment for physical therapy, in particular, for neuro-developmental treatment. It helps to relax the muscles and relieve delayed onset muscle soreness. Fitball is also a great tool for exercises for strengthening abdominal muscles, back, legs, and arms. Therefore, a fitball should be an essential part of your fitness routine.