I had probably the best lesson I ever had today and it was all spent on cantering. Over and over and over. I loved it and my horse was great. I was always able to easily ask for the canter and the response was immediate, so my beginning transition was just short of excellent while my ending transition was just short of good. My horse would go into a very fast counter in the straight stretches and I would have a tendency to use the reins first, before I tried any other method. It was just an automatic reaction to pull back on the reins. My instructor advised me to lean back and soften the reins as I held them on her. She said if I needed a small pull, I could just shift my hands back to give a subtle tug. I also found when the counter became accelerated I could usually reach out and pat her neck to get her to begin to slow.
Any advice ? I confess that I really love the fast counter, but know I need to keep a consistent speed.