Leg LockKnee submissionBelt: blue+Risk: highADCCNo-GiSub-OnlyMMA
The inside heel hook is a rotational knee submission applied from the inside sankaku (cross ashi garami) position, targeting the opponent’s medial knee ligaments. It is one of the most effective and dangerous leg locks, especially prevalent in no-gi and submission-only formats due to its high finishing rate and severe injury risk.
Start
Inside Sankaku / inside heel hook position
End
Submission
Prerequisites: Ashi garami entry · Breaking opponent's posture in leg entanglements · Heel exposure mechanics · Two-on-one control for leg locks
Steps
1
Establish Inside Sankaku (Cross Ashi Garami)
From seated guard, thread your inside leg between opponent’s legs and triangle your legs around their far thigh, pinching knees tightly and keeping your outside foot hidden under their far hamstring.
2
Control Opponent’s Far Leg
Clamp your top knee over their far thigh and use a C-grip on their heel to anchor their foot, ensuring their knee is above your hips for maximum rotational leverage.
3
Expose the Heel
Use your inside arm to scoop under their heel, rotating their toes toward your armpit while maintaining dorsiflexion of their foot; keep your elbow tight to prevent their heel from slipping.
4
Secure the Heel Hook Grip
Connect your wrist bone (blade of forearm) to their heel and reinforce with a butterfly grip or rear-naked choke grip, ensuring your forearm is perpendicular to their foot for maximal torque.
5
Hide Your Own Heel
Tuck your outside foot deep under their far hamstring or behind your own knee, keeping your toes flexed and heel hidden to prevent counter leg locks.
6
Apply Rotational Force
Rotate your torso away from their knee line while pulling their heel across your centerline, using your hips to bridge and rotate; keep your chest heavy over their shin to prevent knee escape.
7
Finish with Controlled Tension
Gradually increase the rotational force, monitoring for tap; maintain knee pinch and heel exposure throughout, never sacrificing control for speed.
Key details most people miss
The heel must be fully exposed and isolated above your hip line before applying torque; partial exposure drastically reduces breaking power.
Pinching your knees and keeping your outside foot hidden is critical to prevent opponent from countering with their own heel hook or escaping the entanglement.
The finishing torque should be generated primarily by rotating your torso and hips, not by cranking with your arms.
Your elbow must stay glued to their heel—any separation allows their foot to slip and relieves pressure on the knee.
Chest pressure over their shin prevents them from turning their knee and escaping the knee line.
Common mistakes
Failing to hide your own heel allows opponent to counter with a heel hook, leading to a double leg lock scenario.
Letting your knees flare open reduces control and allows opponent to clear their knee line, escaping the submission.
Applying force before fully isolating the heel results in slipping grips and failed submissions.
Trying to finish with arm strength alone instead of rotating the whole body leads to weak breaking mechanics.
Not controlling the opponent’s far leg enables them to roll or spin out of the entanglement.
Counters & responses
They try: Opponent turns knee outward and attempts to clear knee line
You do: Pinch knees tighter and scoot hips backward to re-trap their thigh above your hip line before reapplying the finish.
They try: Opponent attacks your exposed heel for a counter heel hook
You do: Immediately hide your outside foot under their far hamstring or behind your own knee, prioritizing defensive positioning before resuming attack.
They try: Opponent rolls explosively to relieve pressure
You do: Follow the roll, maintaining chest pressure and knee pinch, then re-set the heel exposure before finishing.
They try: Opponent hand-fights and peels your grip off their heel
You do: Switch to a butterfly or rear-naked choke grip, reinforcing with your second hand and re-securing the heel.
Drill prescription
6 rounds × 2 min; 50% resistance; alternate roles each round; goal: 5 clean heel exposures and controlled finishes per round, no knee line escapes allowed.
How the masters teach it
John Danaher
Systematized inside heel hook mechanics and positional hierarchy, emphasizing heel exposure and knee line retention.
BJJ Fanatics
Gordon Ryan
Applies relentless control and finishing mechanics, using torso rotation and back exposure threats to trap opponents in inside sankaku.