Key idea
Recognize the armpit as the upper-arm control point.
In this ground example, kneels beside left side as Uke lies prone. Tori controls Uke’s left wrist with both hands and holds the upper arm beneath the armpit. The wrist and upper-arm controls align the elbow for ; mirror for the right arm. Apply pressure gradually and release immediately on a tap, verbal submission, or . Never fall or throw while an arm is trapped in this lock. Arm-lock permission varies by event and age category.