I think exercising, stretching, and the way that spinning babies teaches moms to be aware of where their baby lies, is all really good stuff. I also think staying limber through physical activity is the best way to feel good mentally and physically during labor.
I really do like spinning babies. I think if the stretches feel good to you, then you should keep doing it!
I also really like evidence based practice. I think Henci Goer is a rock star. I think this is a good read for those of you who have or worry about OP babies.