Is it necessary to buy a speed ball?

Yes Wave speed ball is a kind of spherical fitness equipment, also known as BOSU semicircle balance ball. It consists of two semi-circular spheres, which can be used for various fitness training. Wave velocity ball has many functions and can be trained on different surfaces. The stability of the core can be trained on the spherical surface, or the balance and stability of the bottom surface can be trained in reverse. In addition, the wave ball can also exercise the muscles of the whole body, including the core muscles, hip muscles and leg muscles, so buy the wave ball.