The acting and the prison life part is good.
However, everything around the training of the horses is bad, and actually upsetting when you know how horses should be trained. Very badly done. There is a lot of shouting at the horse, hitting the horse… Then a very large man that has never ridden a horse, gets onto a small mustang, and starts yanking at his mouth, bouncing around on his back, and it becomes a really really a bad movie.