Mechanical Advantage
Mechanical advantage is the ratio of output force to input force in any technique. Jiu jitsu systematically places your strongest muscle groups against the opponent's weakest joints and structures. Recognising and maximising this ratio is the difference between forcing a technique and executing one.
The americana pins the opponent's wrist to the mat and rotates the shoulder using both arms against one. Two arms versus one shoulder joint creates an overwhelming mechanical advantage.
Back control puts your four limbs against an opponent who can only reach behind them with limited range. The mechanical advantage of attacking from behind eliminates roughly half of your opponent's defensive tools.
Mount places your hips directly on the opponent's torso, using gravity and base to maintain position. The top player's weight acts through their centre of mass while the bottom player must bench-press to create space.
The heel hook attacks the knee ligaments by rotating the foot while the shin is controlled in two directions. Your entire body torques a joint with almost no muscular protection — mechanical advantage at its most extreme.
The D'arce threads your arm under the neck and through the armpit, using the opponent's own shoulder as compression. Squeezing your arms together and walking your hips generates a mechanical squeeze that tightens without needing raw grip strength.
The bow-and-arrow choke uses the lapel as a cable across the neck while you extend your body in the opposite direction. The distance between your pulling hand and extending legs creates a lever arm measured in feet.
The body triangle locks a figure-four around the torso, using your legs — the strongest muscles in your body — to compress the opponent's ribs and diaphragm. No amount of core strength resists sustained leg compression.
The kneebar hyperextends the knee by bridging your hips against the joint while controlling the ankle. Your hip bridge — one of the strongest human movements — versus a single joint creates decisive mechanical advantage.
The arm triangle uses the opponent's own trapped shoulder as one wall of the choke while your arm provides the other. Walking your hips in tightens the choke mechanically without requiring you to squeeze harder.
The crucifix traps both arms using your legs and body, leaving the opponent's neck completely undefended. Controlling two limbs with your legs frees both your hands to attack — a three-on-zero mechanical advantage.
Every technique in jiu jitsu is a lever. The fulcrum, load, and effort arm are designed so that a mechanically correct application overpowers raw muscle every time. Training leverage means learning where to place your body so physics does the work.
Skeletal alignment beats muscular effort. A properly aligned frame — where bones bear load instead of muscles — can sustain indefinitely what muscles can only hold for seconds. Jiu jitsu rewards those who build structural barriers rather than muscular ones.
The fulcrum is the pivot point of every lever in jiu jitsu. Moving the fulcrum closer to the load — the joint being attacked — multiplies force exponentially. The difference between a submission that finishes and one that stalls is often millimetres of fulcrum positioning.
Your legs are the strongest muscles in your body. Jiu jitsu systematically uses legs against arms wherever possible — guard retention, sweeps, chokes, and control all exploit this strength asymmetry. When your legs are engaged, you are using your strongest tools against the opponent's weakest.
This is the map. Mechanical Advantage — every related position, submission, and transition it governs — lives in the app. Offline, no account.