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When you first inflate your fitness ball, follow the manufacturer's instructions and fill the ball to the point where it gives slightly when pushed. It should not be so tight that there is no give at all, but it should not be too squishy, either. Then you can add more air as desired, but the ball should not be so tight that there is no give at all; you may need to experiment. Remember that a firmer ball is more difficult to sit on, so if you are new to a fitness ball workout, start with a less firm ball that provides a wider platform for sitting.