Rollkur or hyperflexion of the horse’s neck is an illegal practice in equestrianism defined as “flexion of the horse’s neck achieved through aggressive force” and is banned by the world governing body, the International Federation for Equestrian Sports (FEI).

In practice, it consists of closing the horse in a way that his mouth nearly touches his chest. This can cause pain as well as irreversible physical damages to the horse topline and neck.