fun fact! while that move is mainly for show now, it originated from when we used horses in wars and battles so they trained the horses to do this and absolutely obliterate anyone behind them
(yes that means someone would be on the horse while it does this)
Fun fact! This particular movement was never actually used in war. In battle the horse would be wearing heavy armor and it would be very hard to do it. In addition, he has to dance in place for a pretty lengthy amount of time before he jumps and this would give anyone around him a long time to get out of the way. While it was taught in those eras, it was moreso to help the horse learn to be balanced and agile, not to perform in battle. They also just taught it to show off sometimes. (Source)
