An exercise ball is suitable for fitness, yoga and physical therapy. Various exercises are possible, including core stability and strength training. The ball can also be used to contrast the office chair, for better posture and stronger muscles. The ball comes with a flyer that contains several example exercises. The ball is available in three sizes. The best size for you depends on your height. The ball of 55 cm is suitable for a body length of 140-160 cm. The ball of 65 cm is suitable for a body length of 160-185 cm. The ball of 75 cm is suitable for a body length of more than 185 cm.