Body Triangle

Quick Introduction

The body triangle is a figure-4 lock formed by your legs around the opponent's torso from back control. Instead of digging hooks into their hips (which they can strip), you cross one leg over their body and tuck your foot behind the opposite knee, forming a triangle around their waist. This is widely regarded as the strongest back-control grip in BJJ.

In Japanese, this configuration is traditionally called 胴締め (dō-jime). In English-speaking gyms, it's universally "body triangle".

Position Overview

From: Back Mount | Function: Replaces hooks; locks the position against escape; sets up RNC, bow-and-arrow, armbar

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How to Lock the Body Triangle

1. You're on the back with seatbelt grip (one arm over shoulder, one under armpit, hands clasped) and standard hooks (feet inside their thighs)
2. Pick a side — usually the side opposite your over-arm in the seatbelt
3. Pass the top hook (foot) over their lower hip onto their belly
4. Drive your top knee across the centerline of their torso
5. Slide your bottom foot up behind the top knee, locking a figure-4
6. The triangle is now formed: top thigh across their belly, bottom shin/foot wedged behind the top knee
7. Squeeze knees together and expand hips for maximum compression

Key detail: The top leg has to cross past the centerline. If your knee only reaches the side of their belly, opponent can grip and peel the leg off.

When to Use the Body Triangle vs. Standard Hooks

Situation	Choice
You're similar size or larger	Body triangle — locks them down
Opponent is significantly bigger	Standard hooks; body triangle won't close
Opponent is flexible / experienced escaper	Body triangle — much harder to strip
You want fast submission attempts	Standard hooks — easier to release and re-attack
Long competition match, control needed	Body triangle — points hold easily

Setting Up Submissions From Body Triangle

Rear Naked Choke

The body triangle frees you from worrying about losing hooks, so both arms can attack the choke unhurried. Standard RNC mechanics apply — squeeze legs harder to drive their breathing while you set the choke.

Bow-and-Arrow Choke

From body triangle, the bow-and-arrow setup is easier because the leg position naturally creates the angle. See Bow-and-Arrow.

Armbar to the Far Arm

1. From body triangle, opponent reaches up to defend a choke threat
2. Trap their far wrist with your bottom hand
3. Roll toward the top-leg side, throwing the bottom leg over their head
4. Land in armbar — body triangle effectively converted to armbar setup

Defending Against Body Triangle Escapes

Their escape	Your response
Walks hand down your top shin to peel	Squeeze knees harder; switch to bow-and-arrow setup
Tries to invert / roll into you	Maintain seatbelt; ride the rotation
Rolls toward bottom-leg side (away from triangle)	Body triangle stays; they end up belly-down with you still on back
Stretches you out by extending	Curl into them; body triangle resists better than hooks here

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Core Principles

1. Past the centerline — top knee must cross past the middle of their body
2. Foot behind knee, not ankle — locking the knee joint is what makes it tight
3. Squeeze + expand together — knees in, hips out, simultaneously
4. Seatbelt stays — the body triangle does NOT replace upper-body control
5. Size matters — body triangle on a much larger opponent will not close; don't force it

Common Mistakes

Mistake	Fix
Top leg only over their hip	Drive the knee past centerline
Foot tucked on ankle	Slide foot up to lock behind the knee
Losing seatbelt setting up	Lock seatbelt first, then build the triangle
Body triangle on someone 20kg heavier	Use standard hooks and constant pressure instead

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Position Connections

• Back Mount — Parent position; body triangle is the strongest hook variation
• Bow-and-Arrow — Natural finish from body triangle
• Rear Naked Choke — Easier to set up with body triangle locking the position
• Back Escapes — Understanding how opponents escape the body triangle improves your own back escapes

Next Steps

1. Back Mount — Master the position before adding the body triangle
2. Bow-and-Arrow — Highest-percentage submission from body triangle
3. Rear Naked Choke — Standard back-control finish, much easier with body triangle locked