Basically, the balls are pumped up. If you inflate more air, please do not exert any pressure on the valve. In no case use a bar pump, because here is the danger that the valve in the ball slips too
large (this is not a reason for complaint). Please use a helmet or hand pump with a flexible hose on the needle or an electric pump. Please note further, you should inflate the ball too much, so that
the seams tear, this is not covered by the warranty.