Dragon Age: Inquisition: In the Saddle beating Seanna's Final course

Mount your horse and go through the posts to beat the race. Click the stick in to make your horse sprint. There are three courses you will have to beat. ... It will take some time to complete so do it as soon as you can. Received a trophy Cavalier – Secure a mount. You can earn a horse quite easily once you enter the Hinterlands watching Seanna's Final course