UFC fights are typically 3-5 rounds (five five-minute rounds for championship bouts). The primary reason for this is that lighter weight fights (such as Featherweight and Bantamweight divisions) usually have three rounds. Heavier weight fights, such as Middleweight and Heavyweight divisions, usually have five rounds. This can be attributed to the different amounts of energy required by fighters in different weight divisions. The lighter weights take less energy, while the heavier weights take larger amounts of energy which necessitates five rounds. Additionally, fights of three rounds tend to be more exciting due to the shorter duration of the fight, while fights of five rounds tend to be longer and more drawn out, making them less thrilling.