Phil. Another excercise worth doing is to stand with the feet together.Put the weight onto whichever side you like. Bend the supporting knee as much as you wish. Point to the side and draw the feet together on the two toes and lower. Repeat on the other leg. Not only is this a strengthener excercise, it teaches how important the bending of the knee is on the supporting foot. Which takes us a stage further than the cicumference comments. After this it should be easy to step forward from a fully lowered position (bent knee) and complete a Closed Change. And further if you wish, turn 90 degrees over your now standing foot and complete the first three of a Natural Turn using the same action.