Countless full body exercises such as back or pelvic exercises can be carried out with the gymnastics ball. Gymnastics ball treatments are used in a wide variety of therapies such as back gymnastics, occupational therapy, physiotherapy, obstetrics, senior gymnastics, etc. It serves not only as a fitness ball, but is also a dynamic seat and is often used as an office chair. Just exchange your office chair for the Tunturi Seating Ball for a few hours and your back will thank you. This ball has a diameter of 55 cm. The Tunturi Gym Ball comes with inflator pump and instructions with various exercises.