The Tunturi Gym Ball is an extremely versatile exercise ball or sitting ball for sport, work and leisure. Countless full-body exercises such as back or pelvic training can be performed with the gym ball. Treatments using an exercise ball are used in various forms of therapy such as back exercises, occupational therapy, physiotherapy, obstetrics, gymnastics for the elderly, etc. It not only serves as a fitness ball, but is also a dynamic seat and is often used as an office chair. Simply replace your office chair with the Tunturi sitting ball for a few hours and your back will thank you. This ball has a diameter of 65 cm. The Tunturi Gym Ball comes with an inflation pump and instructions with various exercises.