Join-Up is a method of training horses developed by Monty Roberts, an American horse trainer. It focuses on building trust and communication between the horse and trainer. The process involves using body language and movement to encourage the horse to approach the trainer voluntarily, creating a bond based on respect rather than fear. During Join-Up, the trainer typically works in a round pen, allowing the horse to move freely. The goal is to establish a connection where the horse feels safe and willing to engage. This technique emphasizes understanding the horse's behavior and instincts, promoting a cooperative relationship.