Excercise to improve a hip movement. Since being taught the following I have regularly included this in my warm up . And that is, on your solo Rumba Walks all the way around the ballroom. Have your two arms extended foreward at shoulder level. Finger tips square to each other. If you find that on any part of your walks that the fingers are not level than you will be losing part of your hip action. Another way is to fold your arms across your chest keeping your shoulders square to the front. To add to this , a slight pull back of the shoulder on each walk will give more of a 3D look than looking like a cardboard cut out. I hope this helps, and as Karen Hardy said "Several years of practice is now needed". I'm On five. Also keep in mind that from the front only one leg can be seen at a time, and keep your already high instep, as you come into a neutral position on the count of and. With your feet now together and level, your knee will be foreward of your body. If your knee is not foreward then your feet are wrong. If you want to look better than your friends get that high instep. All of the above goes for the man also.