Mounted Armbar
Mounted armbar — the arm isolated from above, the leg stepped over the head, and the attacker falling back to land perpendicular with the hip under the elbow. The armbar the mount is built to produce.
Adapted from InGrappling, Mounted Armbar. System Games did not invent this curriculum.
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The mounted armbar isolates one arm from above, steps a leg over the opponent’s head, and falls back to land perpendicular with the hip under the elbow. Hip extension finishes it. Every part of that happens from a position the attacker already owns, which is what separates it from the armbar played from underneath.
The difference is where the angle comes from. From guard the attacker has to make the angle by hip escape, working from the bottom against someone who can posture and stack. From mount the angle is made by stepping over the head, and the attacker’s weight is on the opponent the whole time. Same joint, same finish, opposite problems — and almost none of the guard version’s failure modes appear here. The stack does not exist from mount. The bridge does.
It is finished from S-mount more often than from anywhere else, because S-mount solves the isolation before the attack starts: the leg is already over the far arm, so the defender’s first and best answer — pulling the elbow back to the body — has been taken away by the position rather than by the attacker’s speed. High mount is where you go to make the S-mount available, and the technical mount, quarter mount and gift wrap are the other three doors into the same finish.
Elevated RiskMounted Armbar is an elevated risk technique. Elbow hyperextension against the attacker's hip. What makes the mounted version distinct is the fall: the attacker's whole body weight travels downward as the lock arrives, so the joint can reach its structural limit during the descent rather than after it. The posterior capsule, the UCL and the radial head all take load with very little travel past 0°. The defender is also flat on their back with a leg across their face, which means the attacker often cannot see the tapping hand — agree on a verbal tap before drilling this at any speed. Serious injury can occur fast — the fall supplies the force, so the interval between positioned and loaded is shorter than a deliberate hip extension.
If you are new to this technique: read this section before anything else. Understanding the danger is part of understanding the technique.
The person applying the technique is responsible for releasing immediately.
Communicate before drilling. Know your partner's experience level with this position.