The ball needs to be inflated with a special pump for Rhythmic Gymnastics Ball that contains the optimal amount of air. The Rhythmic Gymnastics Ball is to be inflated gradually in small quantities. These special pumps have a rounded needle that does not damage the valve. When inflating the ball, it is necessary to moisten the pump needle with water to avoid damaging the valve. When inserting the needle into the ball, pay attention so that you penetrate the ball at the right angle. Otherwise it could damage the valve.
When you inflate the ball, check it by touch. It should be a little soft so that you can pick it up from above. Do not inflate the ball too much - you could deform it!