I am fairly new at horses and am currently training a nervous, slightly stubborn horse. The results so far have been rewarding. However, I am determined not to put the horse in a round pen just yet because he is clearly petrified of the pen most likely due to a bad experience. (I will take a view later on whether appropriate to introduce the horse to the pen, when he is ready to be mounted). In the mean time, the horse must be exercised and I am not sure how to proceed with this. I have a coral about the size of a football field and he will run if I pursue him but that is obviously a bad idea; also if I try to lunge him he will probably bolt at this stage of his training.
I would appreciate any ideas on how to exercise him, before I make costly mistakes.
Thank you very much.