Sierra was a Highly Reactive horse bred for Bucking stock at the rodeo,

 Windy Hill Equine Rescue gave her another chance when they got her out of the kill pen, but she was so distrusting that they couldn't touch her,

 So they sent her to Nate, he spent a ton of time teaching her and recorded each session, taking her from being feral to Riding her!

You can get started with the sessions from the beginning right here!