Generally, balls are shipped inflated. If you need to add more air, avoid putting excessive pressure on the valve and slightly moisten the needle. Never use a rigid pump, as there is a risk that the valve might slip into the ball (this is not a valid reason for a complaint). Please use a helmet or hand pump with a flexible hose attached to the needle, or an electric pump. Additionally, if the ball is overinflated and the seams tear, this is not covered under warranty.