I debated whether to post this on the dressage or eventing forum, as the question is dressage specific but the horse is intended for eventing. So while I would like to create a dressage powerhouse, the reality is that we are asking much more basic questions at this point.
I am taking on a project that is coming from the western - specifically barrel racing - world. The mare is wound TIGHT and appears to primarily know how to RUN. Under saddle and on the lunge, she basically just churns as fast as her legs will go at whatever gait was specified and has no concept of how to use herself. I have some plans to start building relaxation under saddle - though am certainly open to tips! - but I do not have as many ideas for retraining her on the lunge line, and would like to have that as an available tool. My current plans are to work on a short (8-10’) line and start with a lot of transitions and introducing additional tools (side reins, potentially double lunge, etc) as the transitions solidify. Any other ideas for retraining a horse to work properly on the lunge line when all they know how to do is run around like an idiot?