Kimura: A White Belt's Biomechanical Guide

1. From closed guard, secure your opponent's wrist with your near-side hand (e.g., right hand grabs opponent's right wrist).
2. Pass your far-side arm (left arm) *under* the opponent's attacking arm, gripping your own right wrist with your left hand, forming a "figure-four" grip.
3. Pull your opponent's arm across their body towards your opposite hip, keeping their elbow bent at approximately 90 degrees.
4. Shift your hips to your right (if attacking opponent's right arm), creating a slight angle away from their body.
5. Drive your left hip down and forward, creating downward pressure on their shoulder blade.
6. Maintain a tight figure-four grip, ensuring your knuckles are facing upwards and your elbows are tucked in.
7. Rotate your hips and torso counter-clockwise (if attacking opponent's right arm), applying outward pressure on their forearm to extend the shoulder joint.
8. Keep your back straight and your base wide to maintain control and prevent them from posturing up.

• Applying upward pressure on the opponent's arm while their elbow is extended: This can cause a rotator cuff tear or a biceps tendon rupture due to excessive tensile force on the joint.
• Gripping the opponent's elbow instead of their wrist: This allows them to escape by straightening their arm, and can lead to wrist sprains for you if they resist strongly.
• Tensing your body and trying to "pull hard": This telegraphs your intentions, allows the opponent to counter your force with their own, and can strain your own shoulder or back muscles.

1. Solo grip practice: Perform the figure-four grip and body positioning 10 times per side, focusing on the grip transition and hip angle, 0% resistance.
2. Partnered grip and control drill: With a compliant partner, practice securing the figure-four grip and maintaining control of the arm for 30 seconds, 5 reps per side, 25% resistance.
3. Controlled Kimura setup: From closed guard, practice the setup and body positioning without applying pressure. Partner offers no resistance, focusing on flow, 5 reps per side, 50% resistance.
4. Slow-motion Kimura application: Apply the Kimura with a compliant partner, stopping before any pressure is applied. Partner taps early, 5 reps per side, 75% resistance.
5. Live drilling with Kimura focus: Attempt the Kimura from closed guard during rolling. Partner defends passively, allowing you to work the setup and finish, 3 rounds, 90% resistance.
6. Live rolling with Kimura attempts: Integrate the Kimura into your regular rolling. Partner actively defends, working on your timing and transitions, 5 minutes, 100% resistance.

• WHEN TO ATTEMPT:
• When your opponent is posturing down in your closed guard, allowing you to isolate an arm.
• When you have established a strong cross-collar grip and can use it to help control their arm.
• When your opponent is trying to pass your guard and leaves an arm exposed.
• PRIMARY COUNTERS:
• Escape by "shrimping" your hips away: If your opponent has your arm in a figure-four, quickly move your hips perpendicular to their attacking arm and attempt to straighten your arm and create space.
• "Stacking" your opponent: If they are attempting the Kimura from guard, drive your weight forward and down onto their chest, collapsing their posture and breaking their grip.
• "Walking" your arm out: If they have the grip but haven't applied significant pressure, try to walk your elbow towards their body, creating slack and allowing you to pull your arm free.

Watch step-by-step breakdowns from black belt instructors: