After last Saturday's class with Sensei Johann, I decided to research a little more about the Kimura Arm Lock. If you want to learn more about it, read below and follow the link from grapplearts.com
Elbow Lock
An elbow lock is a type of joint lock that hyperflexes or hyperrotates the elbow joint. An elbow lock is applied by forcing the arm beyond its normal range of elbow-wise movement, which can be done through a variety of ways. Typically, the body is controlled from moving by using a pinning hold, and the arm is then pulled, pushed or twisted.
Keylock
A keylock (also known as a bent armlock, figure-four armlock or ude-garami) involves holding the forearm and using it to twist the upper arm laterally or medially, similarly to turning a key in a keyhole. It is usually considered to be a shoulder lock since the primary pressure is often on the shoulder, but depending on how it is performed, significant pressure can also be applied to the elbow. It passes for a lock on the elbow in judo competitions, where only elbow locks are allowed. It can be applied from a multitude of positions, and it is the most common shoulder lock used as a submission hold in mixed martial arts competition. The keylock has several variations with their own names, for instance depending on in which direction the arm is rotated. The word "reverse" is sometimes added to signify medial rotation as in reverse keylock or reverse ude-garami, in which case the usage of just "keylock" indicates lateral rotation.
Figure Four Arm-lock/Americana (Ude-garami)
The figure four arm-lock (also known in the USA as the americana) is a term used in Brazilian Jiu-Jitsu to specify the lateral keylock known in judo as ude-garami (arm entanglement). This lock is generally applied only from the mount or side control. The opponent's arm is pinned to the ground so that it is bent at the elbow, with the opponent's palm upwards. The wrist is grabbed with the opposite hand, and the arm on the same side is put under the opponents arm, gripping the attacker's wrist. This results in the necessary figure-four hold. While keeping the opponent's hand pinned to the ground, the attacker begins sliding his or her pinned arm down and parallel to his or her thigh while cranking the elbow upwards. This is referred to as 'painting'. The opponent will feel pressure on their elbow and/or shoulder. From some positions, such as kesa-gatame, it is possible to apply this technique with a leg instead of using two arms.
Kimura (Gyaku ude-garami)
The kimura lock (Reverse Ude Garami), applied on Hélio Gracie by Masahiko Kimura. The arm is twisted unusually far because Gracie refused to submit.Kimura (Brazilian Jiu-Jitsu), chicken wing/double wristlock (wrestling), or reverse keylock are terms used to specify a medial keylock known in judo as gyaku ude-garami (reverse arm entanglement) or simply as ude-garami. The application is similar to the americana, except that it is reversed. It needs some space behind the opponent to be effective, and can be applied from the side control or guard. Contrary to the americana, the opponent's wrist is grabbed with the hand on the same side, and the opposite arm is put behind the opponent's arm, again grabbing the attacker's wrist and forming a figure-four. By controlling the opponent's body and cranking the arm away from the attacker, pressure is put on the shoulder joint, and depending on the angle, also the elbow joint (in some variations the opponent's arm is brought behind their back, resulting in a finishing position resembling that of the hammerlock outlined below). The kimura was named after the judoka Masahiko Kimura, who used it to defeat one of the founders of Brazilian Jiu-Jitsu, Hélio Gracie.
To learn more on how to apply the Kimura Arm Lock follow this link: http://www.grapplearts.com/Kimura-Article.htm
Kimura (top) applying the ude garami to defeat Helio Gracie in their match in Brazil in 1951.
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