MMA combines multiple styles of martial arts in competition. Styles can vary widely from various striking (such as muay thai or karate), and grappling (such as jiu jitsu or wrestling) martial arts disciplines. In order to be effective in MMA, you must be able to transition seamlessly from one style to the next depending on the current situation. One of the favorite ways to transition from striking to grappling is with a takedown, such as a single leg.
This video demonstrates how to perform a single leg take down for MMA. Enjoy!