UFC fights typically take place on the ground because it is a combat sport that utilizes grappling techniques, such as wrestling and jiu-jitsu, to control and defeat an opponent. Since fighters are typically trained in these techniques and are able to attain dominant positions from the ground, it is advantageous to take the fight to the ground. Additionally, UFC fights take place in a caged octagon which limits the room to move around, making it easier to take the fight to the ground and finish the match with a submission.