while I'm trying to learn dancing tango argentino (but: my question wont be about dancing, this is just for background) i came to some (as it seems to me) physical limits in flexibility of my upper body. In tango, one must be able to rotate the upper body horizontally. I've got some problems with this exercise, predominently while doing it quick and short or accurately.
Now comes to my question: What muscles, what antagonists and what other factors determine upper body rotation? Is there something else then lateral abdominal muscles? Some minor muscles? anything? And: How can i train a) a more smoothy and accurate and b) a more quick and strong (but still accurate, therefore, without disarrange e.g. shoulders or alike) upper body rotation?
Hopefully it's understandable - writing some english text merely once a month is always an adventure