I got this exact product more than 2 years ago from Marshall's. I still use it. You have to use the air pump they give you with it. It takes time to pump it up but it does get big. I pump it the size, they have at my GYM, Lucielle Roberts. My trainer at Luicielle Roberts also showed me different ways to use the ball besides what they teach you on the DVD. You can also Youtube different things to do with it. Ha ha, I even try belly dancing moves on it too!