What is Armbar in BJJ?

The armbar (juji gatame) hyperextends the elbow joint by controlling the wrist and lifting your hips against the elbow. It's applied from many positions - guard, mount, side control, back. The attacker's legs control the opponent's body while they extend the arm against their hips. It's often the first submission taught because it demonstrates core BJJ principles: control, leverage, and attacking joints.