I've had two posterior births owing to my roomy accommodation, DS was 4.81kg and had loads of room to keep spinning around in their, he turned anterior two pushes before he was born. It also caused a hellish four weeks of pre labour but the best thing I could do to turn him the right way was swim. Every morning I went to the pool, did a bit of breaststroke and floating on my belly with a kick board and he'd turn, I'd get out, have contractions, ponder a public delivery in the pool, get in the car and the little bugger would turn back on the way home. If I had my time again id fill up the birth pool to do my belly floating at home, the reclined position in the car was a killer. So see if you can get a body of water big enough for floating within walking distance of your home! Good luck