While lunging Harry in the round pen he turns his butt to you when you direct him to go the opposite way. I knew it was 'bad' but was lazy and let him get away with it. Today I went out and attempted to teach him the correct method. He now turns into me to go to the LEFT but he refuses to do it going right. He will constantly turn his butt to me to turn right and he gets down right indignant if I attempt to calmly/gently steer him into the correct way of doing it. He got to the point where he'd shove his nose onto the fence because he refused to even turn his head to be lead around the 'correct' way.
He responded fantastic to the left and obviously enjoys offering it to me. Why won't he turn right?
I put him on a long line to attempt to steer him, but he fought me. We ended up doing tight circles at a trot so that I could quickly get behind him and pull his head around.
What should I do?