Mistress Anfisa has for a long time been looking forward to a small walk with her slave horse. She puts the rope around his neck and sits down on his back. Of course she won't be walking herself. Her human pony does that for her and carries her on his back. Mistress Anfisa takes a whip to help the pony go and tries to drive him to top performance. Round and round he walks, just as his strict female rider wants him to. You can see how exhausting it is for him... This loser pony sweats and snorts. He simply has no conditioning! That's a good reason to sell this stupid horse!
Mistress Zora's slave trots after her like an old donkey until she doesn't feel like walking anymore and straddles his back. Fot as long as she wants, the slave will let her ride on his back. Too bad for him that Zora is bored on his back and already has an idea how she can humiliate him further. She stops her pony and dismounts him. She makes him take off her sneakers then pushes his face into them and orders him to inhale deeply. Does that improve his ability to be a good slave pony?! Mistress Zora tries it out and lets him breathe the scent!
For Angelina it's just normal to train her slaves to be a human pony during their slave training. As a young dominatrix she knows exactly how to make submissive slaves follow her orders. Just like this slave should feel honored to be allowed to serve this goddess as a pony. And when her pony can't take it anymore? Then Angelina will just make it move with some kicks!