I've never cowed any of my horses but I've thought about it. My mare's pleasure bred but is very easily bored, she was unhappy going around the ring low and slow. I do reining with her now and she gets very into the maneuvers and is much happier. I did Warhorse Challenge with my Araloosa gelding after I retired him from the pleasure ring, but our WC group disbanded so I haven't done it in a year or two. Now that I think about it, Warhorse and working equitation would be right down Nala's alley too - she loves working with a purpose and will play all over a trail course if I let her. I'm sure some others at my barn would enjoy a break from railwork, too!
Thank you for the information and videos! I'm all about improving agility, athleticism and partnership with my horses and this is a great way to do it. Looks like I'll be breaking out the trail obstacles again soon! :)