Waltz. Foxtrot if you like. Try Waltz Solo. Put your hands by your side fingers probing into the thigh muscles. Just do the first 3 of a Natural and feel which muscles are working. Come together on 3 and stay there. Again feel which muscles are in control. Make sure you are using them all through your dancing.
Wear a tie. put your right arm in the correct ballroom position. Grasp the end of the tie with your right hand and keep it taught. Now try a Reverse Turn in the Waltz. Is the tie still taught, or has your body come around and left your right arm behind.
This guy just could not stop looking at the floor. So they put one of those neck braces on that is used for whiplash injuries. That cured it.
Another just could not keep his head looking to the left. He very often after a turn, finished looking into his partners ear. A bootlace around the shoulder with the end in the mouth saw an immediate improvement.
It all sounds a bit stupid but it does get results, especially the one with the tie. Happy New Year To You All.

Don - it doesn't sound stupid at all. 'Props' like this are great. Bootlace in the mouth - never thought of that - might try it meself.
not sure about the tie one. Couldn't you have your arm falling behind on the turn, yet still have it taut? Will try this out myself.
Anyone any other ideas? I had (maybe still have) a problem with letting my left hand get too high. I tied some string from my wrist to a loop on the belt of my trousers. It was ok, but if i did any significant sway, my arm was pulled out of alignment with my shoulders. Nevertheless, it was helpful and has at least reduced the problem.
Any ideas for a prop to keep the two upper bodies well separated and not moving in towards each other on turning steps?

Phil. Arm being pulled out of alignament. The whole idea of using a prop , your one, is to make sure that in relation to your body it doesn't move
The right arm with the tie is to keep the arm in one place. Another way but not practicle is in ballroom position, would be to set the whole of your arm in plaster. When your body turns I'm sure that the arm would go first. This will most likely bring forth an argument. But I will quote John Wood who says don't be stingy with your arms. When you think about it the arms are in front of the body. So I would ask which goes first the arms or the body. A while back I was wrongly told that my left arm in particular was just ba decoration and might as well be cut off. Then I came across Wood's tape which put me on the right path. And my present teachers teach that the arms move ahead of the body and to feel that I am literaly placing my partner where I want her to be. Remember . Felt but not seen.