Generally, balls are shipped inflated. If you need to add more air, avoid putting pressure on the valve and moisten the needle slightly. Never use a stick pump, as there is a risk of the valve slipping into the ball (this is not a warranty issue). Always use a helmet or hand pump with a flexible hose on the needle or an electric pump. Additionally, if the ball is overinflated, causing the seams to tear, this is not covered under warranty.