In street self defense situations, it is very common for the attacker to extend their arm towards their target, as either a strike or a grab.
In the instance that it is a grab or an attempted choke, they are inadvertently giving us the opportunity to do an armbar on them, depending on the position.
In this case, it is from the Closed Guard, where they are in between our legs in Stage 1. They somehow managed to sneak their arms through, and start posturing up and choking us.
To this end, we grab the same side hand/wrist, hook the other hand under their leg, spin like a turtle on it's back 90 degrees, bring the other leg around and over the back of their neck. Once you are their, you pull your leg-grabbing hand back to grab their arm with both of yours. Bring their arm south, making sure their thumb side is facing up. Then, simultaneously, bridge your hips up while pulling their arm downwards with your hands.
And THAT is the Armbar from the Guard! Go slowly with your partner, this joint lock happens pretty fast. Think about it - it is your whole body putting pressure on their elbow, as you are pulling down their arm like a lever. It is a VERY powerful technique. In fact, you can see Royce Gracie apply this in UFC 2 against Jason DeLucia!
The Armbar is a joint lock submission that UFC fighter Ronda Roussey was famous for. She won a good number of her fights with the Armbar, and was known as "The Arm Collector"!
But sport--fighting aside, it is a tremendously effective self defense technique that everyone should have in their toolbox. Anytime someone is in your guard and they extend their arm, take it and break it! We did it in the form of a choke, but it could have been a shirt grab, a neck crank, a hair grab, really, anything that has their arm extended.
The challenging part is getting that 90 degree angle turn on your back. Practice that, once you get better and better at it, it will become easier.
When you are being the partner, spread your knees out kind of wide with a strong base, because it is very easy to get knocked over when they swing their other leg around.
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