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OKRHA About Join the OKRHA Trainers Events Youth Results Contact More Welcome to OKRHA. The Oklahoma Reining Horse Association was formed to serve the needs of reining horse enthusiasts in the Oklahoma region while supporting neighboring reining affiliates and the National Reining Horse Association. Our intent is to promote and encourage development of the sport of reining on a local regional and national level. We do this by working hard to put on the best events possible from our shows to our clinics and to our banquets.