I have many young horse on my farm and they have such respect for me and my daughter and that is because we never allow them to play with us. Everything we do has to do with training, but we do it suptully. We might spend five minutes and in that time, we teach that they have their space, I actually teach them just by holding them under the neck and getting them to turn their hind quarters away, the same with moving shoulders. To keep tlhem off me I actually use my hand which I raise to the eye and if they don't back off, I use the handle of a whip which is soft and yet big enough that they feel me push them off. Consistancy is so important. I have known horses that have been allowed to play and it got nasty. We are the Alpha and they respect us for that. I can stand in the middle of my heard and never feel affraid, because they have respect for me. I am not their toy. Yet they love me totally!
I also like Tellington Jones methods. We all have to find what works for us. There are many trainers and basically they all teach the same reasoning. Tommy Garland and Chris Cox are two of my favorites. One does not need to lunge, all this can be done with small space and halter and leadline. Check around there are many techniques to try.