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Brazilian Jiu-Jitsu is the premier ground-fighting martial art. It was made famous in early mixed martial arts competitions in the mid 1990’s. It specializes in submission grappling when both fighters are on the ground. Techniques include positional control, takedowns and submissions such as chokes and arm locks. Most techniques involve both fighters on the mat. There is a heavy emphasis on positional strategy that focuses on the fighter who is in the top position, and the position of each person’s legs. Positions are stable situations from which a large variety of techniques are available to both fighters. Specific techniques taught are designed either to improve one’s position or as finishing submissions. Most submissions are either chokes (cutting off blood supply to the brain) or arm locks (hyper-extending the elbow, or twisting the shoulder).