Balls are generally shipped inflated. If you need to add more air, avoid applying pressure directly to the valve and moisten the needle slightly. Do not use a fixed-handle pump, as it may cause the valve to push into the ball (this is not a valid reason for a claim). Please use a helmet or hand pump with a flexible hose on the needle, or an electric pump. Also, note that if the ball is over-inflated and the seams tear, this is not covered under warranty.