I use mine most days, I don't tend to bounce on it too much as I think baby is engaged now anyway, will find out for sure next week at next MW appointment. But i things its great to sit on just watching TV it improves my posture and makes me naturally sway on it and roll my hips which is all good excercise I guess, and relieves some of the pressure I have/aches and pains I constantly have. Plus it works wonders when I want a massage as I just sit on the ball in front of the couch and my OH puts his legs round the ball and gives me a nice back massage, (doesn't happen very often though) lol. Then othertimes rather than sitting on the ball sometimes its more comfortable to actually just sit on the floor and then lean on the ball to support my back! I love the ball! lol