MMA is a sport, but not a specific rules-set. As a relatively young sport there have been several iterations of the rules in recent years, and even now there are noticeable differences between organisations in the West such as the UFC and Bellator, and organisations in the East such as Rizin and ONE. We look at the differences between the rule-sets, how they affect the ways we train the sport and how they affect the ways in which we watch, consume, and understand it as spectators.