The pilates ball Gym Ball FN-21039 by Fila with a diameter of 65cm, is a basic and essential exercise tool that can be used by everyone. Its unstable surface not only exercises the abs and core, but also the whole body depending on the exercises you perform. It improves your strength and fitness while also enhancing balance and coordination of movements, protecting your joints. The package includes a pump so you can inflate or deflate it according to your needs.