The cervical rachis is an anatomical structure that is highly exposed in combat sports, both individual and collective. In rugby, prevention is central to our practice. With Laurent DELBOULBES, professional rugby player, we will share our respective experiences. After a brief review of the physiology of isometric contraction and the anatomy of the cervical spine, we will present a typical prophylaxis session, where the Link dynamometer plays a central role. Afterwards, I will explain why I call the Link “the Swiss Army Knife” of the practice, through other examples of use. Finally, Laurent will explain the role of the Link during the confinement period, both for the maintenance of his cervical musculature (to avoid deconditioning) and in the rehabilitation of a rupture of the biceps brachialis operated on at the end of March.