If you have bought the ball and did not take rent or friends for some time, it is recommended to read the instructions. It is in the box with the ball. Most likely, you will need to remove all the contents from the packaging. Please note there is no point immediately inflate the ball to a peak, so you can spoil it.
The process of filling the balloon with air need to start with the assembly of the pump: The pump is attached to a small air hose, then insert a special needle. After connecting the pump and gymnastic ball start to pump it with air. Try not to pump the ball, guided by incomplete pumping (~ 80-85%).
Now leave the ball alone, after 30-40 minutes further inflate it to the desired state. Pay attention to the diameter of the inflated ball. Each model has its limits, which is indicated on the packaging or in the instruction manual. Try not to go beyond that. For what it's all done? This procedure is divided into two steps, it is necessary, primarily, to the user of the ball. In the first step, you can make sure that the ball will not burst under you.
Do not forget that the inflation procedure, passing near an open flame, heating heaters or hazards can lead to irreversible consequences. Take care of yourself and your loved ones.