In addition, the fitness ball is an inflatable rubber ball, which is about one meter straight. It is specially designed to bear the weight of 400 kilograms. Because the fitness ball is a sphere, people can practice how to control muscles and balance when using it to support their bodies for exercise. Basically, fitness balls can help to exercise the muscles of the whole body, and the effect of waist and abdomen is the most obvious. Fitness balls can also exercise our central nervous system. Because the fitness ball can stimulate the palm of your hand, you can exercise the central nervous system at this time to achieve the effects of calming the nerves, refreshing your mind, strengthening your brain and improving your intelligence.