SAFETY: Kimura from Knee on Belly targets the Shoulder joint, rotator cuff, and shoulder capsule. Risk: Rotator cuff tear (supraspinatus, infraspinatus, teres minor, subscapularis). Release immediately upon tap.
The Kimura from Knee on Belly exploits the natural defensive reactions that KOB pressure creates. When the bottom player pushes against the knee or reaches across their body to alleviate diaphragm pressure, their far arm becomes exposed for figure-four grip capture. The elevated hip position of Knee on Belly provides superior rotational leverage compared to side control or guard-based kimuras, allowing greater torque on the shoulder joint with less effort. The bottom player faces a compounding dilemma: absorb the crushing knee pressure and risk respiratory distress, or push the knee away and expose their arms to the shoulder lock.
The finishing mechanics differ from other positions because the top player can choose to finish in place by driving the captured wrist toward the mat while maintaining knee pressure, or step off to north-south for a more controlled rotational finish. The north-south transition removes the bottom player’s bridging ability and creates a tighter arc of rotation on the shoulder. The grip capture itself benefits from gravity — the top player’s weight assists in pinning the opponent’s elbow while the figure-four controls the wrist. Competition data consistently shows this as one of the highest-percentage kimura entries in the sport, particularly effective after the top player has broken down the bottom player’s defensive frames with sustained KOB pressure.
Category: Joint Lock Type: Shoulder Lock Target Area: Shoulder joint, rotator cuff, and shoulder capsule Starting Position: Knee on Belly From Position: Knee on Belly (Top) Success Rate: 62%
Safety Guide
Injury Risks:
| Injury | Severity | Recovery Time |
|---|---|---|
| Rotator cuff tear (supraspinatus, infraspinatus, teres minor, subscapularis) | High | 3-9 months with potential surgery requirement |
| Shoulder capsule damage and dislocation | CRITICAL | 6-12 months, may require surgical repair |
| Labral tear (glenoid labrum) | High | 4-8 months, often requires arthroscopic surgery |
| Bicep tendon strain or rupture | Medium | 6-12 weeks for strain, 3-6 months for rupture |
Application Speed: SLOW and progressive - 3-5 seconds minimum in training, allowing partner time to recognize danger and tap
Tap Signals:
- Verbal tap (saying ‘tap’ or making any verbal distress sound)
- Physical hand tap (multiple taps with free hand)
- Physical foot tap (multiple taps with either foot)
- Any distress signal including screaming or unusual sounds
Release Protocol:
- Immediately stop all rotational pressure the instant tap is felt or heard
- Return the arm toward neutral position (externally rotate back to starting position)
- Release the figure-four grip completely
- Allow partner to self-assess shoulder mobility before continuing
- Never release suddenly or allow arm to spring back forcefully
Training Restrictions:
- Never spike or jerk the submission - rotation must be smooth and controlled
- Never use competition speed or surprise attacks in training
- Always ensure partner has at least one hand free to tap
- Do not apply while partner is in awkward body position that prevents tapping
- Never combine with weight pressure that restricts breathing while finishing
- Respect immediate taps without testing partner’s pain tolerance
Outcomes
| Result | Position | Probability |
|---|---|---|
| Success | game-over | 62% |
| Failure | Knee on Belly | 25% |
| Counter | Closed Guard | 13% |
Attacker vs Defender
| Attacker | Defender | |
|---|---|---|
| Focus | Execute and finish | Escape and survive |
| Key Principles | Use KOB pressure as the primary submission setup — the diaph… | Keep elbows tight to your body at all times under KOB pressu… |
| Options | 6 execution steps | 4 defensive options |
Playing as Attacker
Key Principles
-
Use KOB pressure as the primary submission setup — the diaphragm pressure forces arm exposure
-
Capture the figure-four grip before committing to the finish — premature rotation without control loses the position
-
Pin the opponent’s elbow to their body or the mat before applying rotational force on the wrist
-
Maintain chest-forward weight distribution during the grip fight to prevent guard recovery
-
Recognize when to finish in place versus stepping off to north-south based on opponent’s defensive posture
-
Control the wrist at the point of capture — losing wrist control means losing the submission
Execution Steps
-
Establish heavy KOB pressure: Drive your knee into the opponent’s solar plexus with your weight directed forward through the conta…
-
Identify and capture the target arm: Watch for the opponent’s far arm extending to push your knee or reaching across their body. The mome…
-
Secure the figure-four grip: Thread your near hand under the opponent’s captured arm and grip your own wrist to complete the figu…
-
Pin the elbow and consolidate control: Drive the opponent’s elbow toward their hip using downward pressure from your figure-four. Their upp…
-
Choose finishing position: Evaluate whether to finish in place or step off to north-south. If the opponent is flat and immobili…
-
Apply controlled rotational pressure: With the elbow pinned and figure-four secure, slowly rotate the opponent’s wrist away from their bod…
Common Mistakes
-
Releasing KOB pressure too early before securing the figure-four grip
- Consequence: Opponent regains composure and frames effectively, preventing arm capture and allowing guard recovery
- Correction: Maintain knee pressure throughout the grip capture phase — only reduce pressure after the figure-four is locked and elbow is pinned
-
Attempting to finish without controlling the opponent’s elbow
- Consequence: Opponent straightens their arm and extracts it from the figure-four, losing the submission entirely
- Correction: Always pin the elbow to the torso or mat before applying rotational force — the elbow pin is the foundation of the kimura finish
-
Jerking or spiking the rotation instead of applying progressive pressure
- Consequence: Risk of serious shoulder injury to training partner and potential disqualification in competition
- Correction: Apply rotation slowly over 3-5 seconds in training, giving the opponent clear opportunity to tap before the joint reaches its end range
Playing as Defender
Key Principles
-
Keep elbows tight to your body at all times under KOB pressure — arm exposure is the primary vulnerability
-
Address the positional pressure first through frames and hip escape before worrying about submission threats
-
Recognize grip capture attempts early and retract exposed arms before the figure-four is secured
-
If caught, prioritize preventing the elbow pin over fighting the wrist grip — a pinned elbow is the point of no return
-
Use bridging toward the attacker to create slack in the figure-four rather than pulling away
-
Maintain grip anchors on your own belt, pants, or lapel to prevent the rotational finish when caught
Recognition Cues
-
Attacker releases their far-side pants or belt grip while maintaining KOB — this frees their hand for wrist capture
-
Attacker’s eyes and head orient toward your far arm rather than maintaining forward pressure posture
-
Attacker begins shifting their weight laterally toward your far side, loading up for the grip transition
-
You feel increased knee pressure immediately before the grip attempt — the attacker drives harder to provoke a push reaction
Escape Paths
-
Bridge toward the attacker and extract arm from the figure-four before the elbow pin is established, then immediately frame and shrimp to recover guard
-
Use the attacker’s weight commitment to the kimura grip as an opportunity to shrimp away and recover half guard or closed guard
-
Roll toward the attacker in the direction of the kimura rotation to relieve shoulder pressure and scramble to turtle position
From Which Positions?
Match Outcome
Successful execution of Kimura from Knee on Belly leads to → Game Over
All submissions in BJJ ultimately converge to the same terminal state: the match ends when your opponent taps.