Yep, I say spinning babies too. When you do sit on a couch, sit on a cushion so your knees are lower than your hips. If you're on a kitchen/dining chair, sit backwards. Fit ball is great, I always use mine.

The other advice I got was to get on a swing set and rock up a really good swing - works if you know the baby is posterior - the big swing action gives it a chance to lift out of your pelvis and turn a bit better. Get off carefully, watching your centre of gravity and balance as you get off, and then when you do, see if you can get into a forward kneeling position. The park where I did it has a table and bench, so I did it there, and it totally worked.

Also, swimming is really good, especially with tumble turns. I added a few extra somersaults - to be on the safe side and to have a bit of fun!