Tough Mudder changes the rules in their signature championship event, World’s Toughest Mudder (WTM), every year. With each change, there is great controversy and great potential. Sometimes the rule changes are in response to feedback or problems they encountered in previous years, or sometimes they just like to change it up. Before I describe the first announced rule changes, I’ll preface the controversy with this. In sports, and especially OCRs, we rely on the organizers to define the rules of engagement, and we challenge ourselves to do our best within those confines.