I've been thinking of asking them if I could bring one of those balls to use at my desk. I have the ball already, just don't know if they'd be alright with me using it here. I'm kind of in the back, though, so, maybe......There are even chairs that are equipped with the ball to sit on. They're strange looking, but, I want one! And, I took pilates, and, want to again! I love it, just have been really slack on my exercise routine. I did take english riding lessons when I was about 17 or 18. I loved working on my posture, but, haven't ridden with that kind of structure in a long time!