Communicate in the right way trough body language is a way to create a relationship with your horse. It is important to keep an eye on the natural characteristics of the horse.
Does your horse responds right to your directions? If he does, you probably communicate right. If he doesn’t, did you give clear enough directions? What is going on in his head right now?
A tip is to avoid that your horse is too much restrained in his natural behaviour. This can cause behavioural problems and stress and that is the reason why he responds not right to your directions.