To understand how to armbar from guard: pick the arm you want to attack and cross grab it at the tricep. Cross grab their shoulder using your other hand, to hold them in place and prevent them from posturing up. Put your foot on the opponent’s hip and connect to their side next to the arm you’re attacking. Then, you use your other leg to hook across their back. Use your legs and hips to turn and get an angle for the submission. Finally, pass your leg over the opponent’s head, then bridge your hips up while keeping your knees tight. When in position, keep your leg heavy on their neck while cranking and wrenching their arm.

The armbar from guard is one of the bread-and-butter techniques in BJJ. You can even call it a signature move. While there are a handful of modern techniques fighters use today instead, when the pressure is on you will always see a closed guard being used to break down and submit people.