OMG, I just got one of these like last week. They're incredible! I had one about 3 yrs ago but never knew what to do w/it. I also never bothered to look at the package and got one that was waaay too big. I'm just starting to incorporate it into my w/o's. I got a book at Marshalls ($4 bucks!) called Pilates on the Ball. I'm reading thru it first; it gives great info, exercises, form, w/o's, etc. Saw it completely by accident.