I KIND OF disagree with turning your head and body in the direction you want to go. Yes, it is okay if you do not do this excessively, just a slight change in your position, because otherwise you may begin to do this when you are riding corners and when you are about to turn off of the center line, etc. If this is the case, the horse that you are riding may start to anticipate what you are planning on doing, and begin to cut corners or turn off the centerline early. Then, when you apply leg pressure to move your horse out, you are just confusing them because you are giving them contradicting aids (i.e. Asking them to turn and go strait at the same time). While a slight change in your upper body positioning (and head) is alright, I think that too much of a change MAY create problems for you and your horse off of a circle if you tend to turn your body off of the circle, also.