Ill admit I used the "run the horse until it wants to stop" technique and it worked well on my mare, however I did it slightly differently. I let her run until she was listening to me. I tried one rein stops on her and they always did nothing but aggrevate her (she's an ex barrel horse and she thinks small circles means take off running as soon as possible) so once I ran her for around 10 minutes on each side she began thinking of things other than running and THEN we started schooling and she didnt worry so much about tossing her head and pulling through me.