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MMA is a combat sport that, according to the Unified Rules put together in the 2000s, has 15 weight classes. However, the UFC is not obligated to include all of them, which is the reason why there are “only” 8 weight classes for men and 4 for female fighters. Each UFC fighter competes in one division where they fight against opponents similar in weight and size, and they can also move up or down in weight to change the weight class.

Read More about UFC Weight Classes Explained – UFC Weight Classes FAQ