I've read and been told it's to establish a balanced horse. That makes sense to me since a balanced horse at canter can turn into an unbalanced horse at counter canter.

Chronicle of the Hoof

charleyharvey wrote:
SM is a smart lady. She'd run circles around half the people on this board who pride themselves on their cleverness and intellect.
RebelsBuckaroo wrote:
SM's all badass keeping illegal chickens in her yard and what not. She's a G.
baxtersmom wrote:
When the Nation of FiSH arises, SM will be the Intelligence and Communications Director.