I didn't teach Lion Heart how to do that. He just started doing it one day when I put him out in the riding ring for exercise. He was orphaned at two weeks when his dam colicked and had to be put down. He is quite the character!
omg way too funny! thats great that he can entertain himself like that, my guy will test the fence and find the dead spots to chew thru, or play with the gate handle and let himself out, not i have a gelding with him and they keep busy doing whatever..lol