I've had this for over a week and still can not inflate the ball. Pump is not even a close match to the ball. I too saw this in my gym and thought I wanted one at home. Should have read all the horrible reviews before I purchased.
UPDATE: I used duct tape, self modified the pump and after a long time I finally got the ball pumped all the way up, BUT the plug is SO WIDE, as wide as a nickel, that it's impossible to pull the pump out and get the plug in before ALL the pressure blows out. I've tried with multiple people and multiple times. Seriously, I think this has to be a fake product. Unusable, total utter waste. Listen to all of these objective reviews, the positive reviews have to be fake.
Introducing the new Bosu ballast ball 45cm. The new, smaller size is Great for all ages. Constructed of high quality, burst-resistant material, it has a six-sided surface design for proper alignment and positioning and has 2.5 lbs. Of multi-dimensional load, which provides a fun, visual effect and audible feedback during lifting, shifting, and shaking exercises. Proudly made in the USA . Phthalate and latex free. Includes Bosu ballast ball, foot pump, and owners manual.