The kimura is a submission hold in Brazilian Jiu-Jitsu (BJJ) that targets the shoulder joint. The steps to performing a kimura are as follows:

1. Start in a top position, with your opponent lying on their back and you on top of them.
2. Pass your opponent’s guard and establish a dominant position, such as side control or north-south position.
3. Reach across your opponent’s body with your arm and grab their wrist with your hand.
4. Bring your other hand across your opponent’s body and grab their elbow.
5. Use your hand on their elbow to control their arm and rotate it away from their body.
6. Use your other hand to rotate your opponent’s wrist towards their face, putting pressure on their shoulder joint.
7. Keep your opponent’s arm controlled and maintain pressure on their shoulder until they tap out or submit.

It is important to note that in order to perform this technique properly you must have control over your opponent’s posture, otherwise they can easily defend it by using their other arm, or posturing. Also it’s important to maintain proper positioning and leverage throughout the execution of the hold.

It’s also worth noting that the kimura can be applied from multiple positions such as guard, side control or even from the back. This is one of the reasons why it’s so versatile and well known submission hold in BJJ.