Take a special pump for inflating gymnastic balls, which can go complete with the ball or be sold separately. If such a pump is you don't have, don't worry, the inflating ball for training you can make a regular Bicycle pump. If you will use a Bicycle pump, it is important to arm yourself and a special needle for balls.
Read the manual and the training goals for training. Remove toys from the packaging, unroll it and allow to lie in the unfolded state at room temperature at least two hours. Remember, the ball should not make up one's mind immediately after bringing home, because you can damage it and therefore it will not be suitable for training. At the same time, you spoiled toys back to the store will not accept, because it is not manufacturing defect and your fault.
Take the air pump, insert the needle to inflate. Take and inflate him with a pump is 85% air. Remember, gym ball tends to stretch over time, as it is made of elastomeric material.
Leave the ball in this state for 20-30 minutes. Upgrade it later to the desired hardness. However, you should know that to pump up the gym ball depending on its maximum diameter specified on the package. Otherwise the ball may burst.