oooohhh. Maybe I could use it at work. I hate our office chairs.
Definitely! I use mine at my desk and it is awesome.
+1. I have used a ball as a desk chair for about two years and it makes a HUGE difference. The first couple of weeks, your back and core is kind of sore because the ball forces you to sit up straight and keep your lower back muscles engaged. I have had almost no lower back pain with this pregnancy and I totally credit the muscles I have built from the ball. It just feels SO much better than a chair.
Bonus - if you a fairly large ball, you will be forced to sit with your knees lower than your hips. According to the birthing class I took yesterday, this type of posture is really important for keeping your pelvis in prime laboring position.