I can learn a lot from a tape or better still a DVD if I know what and how to look. Just a Rumba Walk. I find a top couple and select a piece where one or both are doing a few Rumba Walks. This will be there somewhere even if it is as they are leaving the floor. I look first at the back leg after a foreward walk on the left. What turnout of the foot is there. What part of the ball is in contact with the floor. What is the weight ratio.Is it 80 to 20. As the weight goes foreward towards a nuetral position. What part of the foot is now in contact with the floor as it is being dragged through. How high is the heel off the floor. Now our feet are together the heel is still high off the floor. Our weight is completely on the supporting foot. There is no gap between the thighs. You could not even get a cigarette paper through there. Look also at the amount of hip movement being used. The weight ratio is now 100 to 0.You should be able to lift your none supporting foot from the floor without altering your weight. Now send the foot out.What turnout of the foot is there. When does the knees become locked. and when does the heel touch the floor. From the front you should at this stage see only one leg .The other being hidden by the front leg. What is being done with the arms and hands and fingers at this stage is the right shoulder pulled back slightly to give a 3 D look. All this and we have only taken one step, and it can easily be seen on your own tv screen. I will add one more thing. In Latin the balance has to be perfect. In Modern you can get away with murder. In Latin there can be no adjustments to your foot positions or balance after you arrive without it being considered a major fault.A former teacher from here now living in the USA used to also say we should do as many Rumba Walks as a marathon runner does miles on the road. Espen Salsberg agreed with him. I was there.