Armbar.

What it is

Elbow lock attacking hyperextension through leverage

What you do

TAP URGENCY: MODERATE—sharp elbow pain is the warning sign; typically 2-3 seconds from pain to injury

Common injury: Bicep tear if defender tries to straighten arm forcefully—never muscle out

Common injury: Elbow ligament strain if pressure is applied explosively—attacker must apply smooth rotation

Warning sign: Sharp pain in the crease of the elbow—this signals imminent damage, tap immediately

Partner: Apply hip drive gradually, not explosively; hold pressure, don't crank or jerk

Safe exit: If opponent cannot tap, release immediately on any sign of distress

Post-training: Any lingering elbow pain after rolling indicates overtraining this submission