Rear Body Lock

What This Is

The rear body lock is the standing equivalent of having the back — the practitioner is behind the opponent with both arms locked around the opponent’s torso, their chest pressed against the opponent’s back, and both hips in contact. The opponent cannot turn to face the practitioner, cannot establish a defensive frame, and is in the highest-danger standing position: exposed back with an active clinch.

The rear body lock is not a position of passive holding. It is the entry point to a systematic breakdown sequence — Craig Jones’ rear lock chain — that converts standing back control to a ground back exposure in a reliable sequence of steps. Each step in the chain is the natural response to the opponent’s defence, making the chain adaptive rather than scripted.

Hip-to-hip contact from behind is the key structural element. The practitioner’s hips pressing into the opponent’s hips prevent the opponent from squatting, stepping forward, or creating the base needed to turn in. The hands are clasped at the opponent’s mid-section — not high on the torso.

The Invariable in Action

The rear body lock achieves full body-to-body rear connection. The opponent cannot generate defensive power with their arms trapped and their back against the practitioner’s chest. The connection prevents the opponent from creating the framing space needed for a standard standing defence.

Jones’ rear lock breakdown chain begins with destabilisation to hands — pulling the opponent forward so their hands go to the mat first. Hands on the mat is the four-point position, which is a position of advantage for the top practitioner. From four-point, the chain continues to hip exposure and back control. The rear lock is the standing position that initiates this sequence.

The rear body lock is already destabilising — the opponent is in the worst possible standing position. The breakdown from rear lock to four-point is a second destabilisation that converts standing back control to ground back control. Each step amplifies the control established by the previous step.

Entering This Position

From Over-Under Clinch — Underhook Win + Step Behind

Win the underhook on one side, create an angle by stepping to the underhook side, then step behind the opponent while maintaining contact. As the step completes, the free arm wraps around from the front to close the rear lock. See: Over-Under Clinch.

From Arm Drag

The arm drag redirects the opponent’s arm across their centreline, exposing the back. Step behind as the drag completes and establish the rear body lock immediately before the opponent can pivot to face you. See: Arm Drag.

From Failed Double Leg

When a double leg attempt is countered and the opponent steps to the side rather than sprawling straight back, the practitioner can spin behind and establish the rear lock. The momentum of the failed shot, redirected sideways, places the practitioner behind the opponent.

Control Mechanics

Hip-to-Hip Contact

The practitioner’s hips must press into the opponent’s hips from behind. This is the structural core of the rear body lock. Without hip-to-hip contact, the opponent can squat, step forward, and break the rear lock. The practitioner drives their hips into the opponent’s while maintaining the torso wrap.

Hand Position

Hands clasped at the opponent’s mid-section — over the navel area, not high on the chest. A high grip gives the opponent room to drop their weight and squat the practitioner off; a mid-section grip maintains torso compression and hip control simultaneously.

Chin and Head Position

The practitioner’s chin goes over the opponent’s shoulder — on the side they intend to take the back. Head down into the opponent’s trapezius prevents the opponent from reaching back to grip the practitioner’s head for a counter. A high head that presents the ear allows the opponent to grab and rotate.

From This Position

Four-Point Breakdown

Pull the opponent forward and down — driving the locked hands toward the ground while the chest drives forward into the opponent’s back. The opponent’s hands go to the mat to post. This is the first step of the Jones chain.

Trip to Turtle

Trip the opponent’s near leg while maintaining the rear lock — the opponent falls to turtle position. From turtle, continue the Jones chain to four-point and back exposure.

Back Exposure Direct

If the opponent drops their hips to resist the breakdown, the practitioner pulls one hip and drops to the side, taking the back directly to the mat. This bypasses the four-point step when the opponent’s defensive posture creates the opportunity.

The Jones Rear Lock Chain

Craig Jones’ rear body lock breakdown chain is a systematic sequence for converting standing back control to ground back exposure: rear lock → four-point breakdown → turtle → hip pull → back exposure → strangle.

The chain works because the opponent’s defensive responses are built into the sequence. The opponent who resists the four-point breakdown by straightening up creates the hip pull opportunity. The opponent who goes to turtle from the trip provides the four-point breakdown starting position. The opponent who resists the hip pull has exposed their back for the direct drop.

The key insight is that the chain does not require the opponent to cooperate at any step — it uses their resistance as the next entry. Each step is set up by the previous step’s defence.

Common Errors — and Why They Fail

Error: No hip-to-hip contact — standing too far behind the opponent. Why it fails: Without hip contact, the opponent can step forward and break the rear lock grip. The connection must be hip-to-hip, not just arm-to-torso. Correction: Actively drive the hips into the opponent’s hips from behind. Feel the pressure point — the opponent cannot squat or step forward when the hips are fully engaged.

Error: Grip too high (chest level). Why it fails: A high grip allows the opponent to drop their hips below the grip point and squat the practitioner off. Correction: Clasped hands at the navel or below. The grip controls the mid-section because that is where the centre of mass is.

Error: Head above the opponent’s shoulder line. Why it fails: INV-13. A high head position allows the opponent to grab the practitioner’s head or shoulder and use it to turn in. Correction: Chin over the opponent’s shoulder, head pressed into their trapezius. The head is a hook, not a neutral appendage.

Drilling Notes

• Entry from arm drag. Practise the arm drag step-behind to rear body lock as one connected motion — drag, step, lock. The rear lock is established before the opponent can pivot. Time the entry: twenty reps, alternating sides.
• Jones chain cooperative run. From the rear lock, run the full chain cooperatively: four-point → turtle → hip pull → back exposure. The partner provides appropriate resistance at each step before moving to the next position. Build the feel of the chain before adding genuine resistance.
• Hip engagement check. Partner tries to step forward out of the rear lock while the practitioner maintains hip-to-hip contact. Feedback drill: the partner reports when the hip contact is lost. Practise maintaining contact through their forward steps.

Ability Level Guidance

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