Cow Horse Bit Progression: Two Rein Brad Barkemeyer goes over the next step of cow horse bit progression and covers the two rein this week. By H&R Editors | July 27, 2020 | 1 minute read Watch now! Learn about the tradition of the two rein and how the setup functions for the working cow horse event. Click to watch! What did you think of this article? Submit Rating Thank you for your feedback!