Inside a large indoor riding arena, a white-and-brown horse wearing a bridle and a black harness is trotting

Inside a large indoor riding arena, a white-and-brown horse wearing a bridle and a black harness is trotting. The arena has a sand floor and is well-lit by overhead lights and windows on the far wall. The horse is connected to a purple training lead, held by someone unseen. The camera follows the horse as it moves around the arena.