This is a great movie. Let me preface, though: I am an animal lover and was introduced to horses in a parallel fashion, while living in a residential facility where there was a horse program available. I was "sent" to the horse program, and was not at all inclined to be there in the beginning. I had never been around horses, was pretty damn terrified of them, had some anger problems, and was getting clean off drugs.
I could relate to a number of the characters - over time and with constant support (although I didn't see it as such at the time), I became increasingly attached to working with the horses and letting them teach me. They calmed me and showed me that my lack of patience was only going to get me hurt, and set them back, as well. I worked up in the stables until I was working with rather challenging horses (Samson reminded me of one in particular) and being given more and more trust from the staff.
The BLM mustang program is phenomenal. I had begun researching it this summer having no idea that some of the mustangs were being trained by inmates. I have a whole new respect for this collaboration and find this story to be an incredibly important one to tell. I attribute part of the reason I am where I am today to my being introduced to horses in a rehabilitative manner and am encouraged to see how widespread that work truly is.