I train arabs and they can be tough, but they have excellent memory and are very smart. I like to ride in the pasture and sometimes I have 12 or 13 others with me (some youngsters). Every now and then they like to 'play' with the one I'm schooling. I turn my horse and 'herd' them away like a cow. Not only does it teach the other to leave you alone, but it teaches the one you're on that he has to work and cannot join in on the fun. When I'm out there, I'm the alpha and they need to listen.
Do not go where the path may lead-Go instead where there is no path and leave a dusty trail.