The Gymnasitkball corresponds absolutely my requirements. I bought this ball to help me sitting at desk. The delivery package contains the ball, an adapter for a bicycle pump or compressor (gas station) and 2 closing plugs, which made possible the immediate use. Inflation, I used a stationary bike pump, went super easy. A simple hand bicycle pump I would not use because it could be quite strenuous. The ball holds quite a bit of air. But for the athletes possibly a nice arm exercise. In the beginning you have to re-pumping something until you reach the optimal seat height, since the material only extends (but I have so expected). Go with the ball no unpleasant odors from which I find very good (as the manufacturer assures), the material is very stable, the color corresponds to the figure, the ball size / seat height fits my height (1.68 m, I would recommend to anyone in advance to research) and easily the ball of course. Whether the ball fits to the desk, probably everyone will even find out. At least served the ball the right individual seat height so that if necessary the desk height should be adjusted (my desk is about 76 cm high and it fits so precisely, he is likely to be higher under any circumstances). I really have to say, after the first 10 minutes on the ball at the desk, the sitting feels much "right" to. A resounding "thumbs up" for the ball and a recommendation for all who want to make the work more pleasant desk.