Brazilian jiu-jitsu
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Brazilian jiu-jitsu is a self-defence martial art and combat sport based on grappling, ground fighting, and submission holds. BJJ focuses on taking ones opponent down to the ground, gaining a dominant position, and using a number of techniques to force them into submission via joint locks or chokeholds.
Romulo Barral attempting a triangle choke on Gabriel Vella at the 2009 World Jiu-Jitsu Championship
A Brazilian jiu-jitsu instructor demonstrates how to tackle an opponent.
An Americana armlock submission from traditional side control.
Full Mount is considered one of the most dominant grappling positions.
Self-defense
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Self-defense is a countermeasure that involves defending the health and well-being of oneself from harm. The use of the right of self-defense as a legal justification for the use of force in times of danger is available in many jurisdictions.
This telescopic steel security baton is sold to the public in Japan (2009).
Demonstration of a jujutsu defense against a knife attack. Berlin, 1924.
A Bangladesh Rifles Senior Warrant Officer (left in yellow/green outfit) applies a mechanical advantage control/hold to a United States Marine during a demonstration.
Image: Knee Kick to Groin