How to Choose a fitball

In addition to choosing a fitball suited to our height and our proportions for different exercises to work correctly, we have to keep the ball in good condition. Therefore, in addition to clean with a damp cloth after each session, we will ensure it is air, so that it is not so empty that does not offer enough resistance to our pressure.
Nor is it advisable that the ball is very hard, thus preventing us to exercise comfortably.