Guard Theory

Leg Locks Advanced · No-gi first

The heel hook is rotation at the knee

A heel hook uses the heel as a handle to turn the lower leg while the thigh is held still, so the force arrives at the knee as rotation, which is what separates it from an ankle lock and what makes it dangerous.

Position and problem

You have their leg wrapped in an entanglement, you find the heel, and you pull. If their knee is already past your hips, nothing moves: the whole leg turns with your hands. If they roll, the heel slides out and you end up underneath someone. And if neither happens, the knee is loaded before either of you expected it. The heel hook and the ankle lock look similar from the outside because both begin with a foot in your arms. Mechanically they are different attacks on different joints. The straight ankle lock, often called a straight footlock, pushes the foot into extension and loads the ankle and the calf, and the person feels it build. The heel hook holds the thigh still and turns the foot, and the turn arrives at the knee.

Objective

Pin the thigh above the knee, take the heel as a handle, and turn the lower leg slowly enough that the partner taps before the knee is loaded.

Core concept

A heel hook is a rotation of the shin against a thigh that cannot follow it, and the knee is the joint in between. The knee is built to hinge and to allow only a little twist, so when the foot is turned and the thigh is fixed, the ligaments that resist rotation take the load quickly. The grip on the heel is only a handle; nothing happens unless the thigh is held, which is why the knee line and not the grip decides whether a heel hook exists at all. With their knee inside your legs, on your side of the line your thighs make, the shin can be turned against a fixed thigh. With their knee outside that line, your grip turns the whole leg from the hip and the knee feels nothing. Inside and outside heel hooks turn the shin in opposite directions. In the inside version the entanglement holds the thigh from between their legs, and in the outside version it holds the thigh from outside; which way each one turns is something a leg-lock coach should show you on the body rather than in words. Both are finished by the body turning, not by the arms pulling, because the arms hold the heel to the chest and the hips and shoulders supply the rotation. Whether either is allowed depends on the ruleset, the rank and the age bracket, so check the ruleset you compete under.

Key mechanics

  1. Win the knee line before you look for the heel. Their knee has to be trapped between or behind your thighs, or the rotation you apply is absorbed at the hip and the heel simply turns with the leg.
  2. Pinch the thigh and close the hips. Space between your hips and their thigh is room for the knee to turn and follow the foot, which is the defence working before you have started.
  3. Expose the heel so it faces your chest, with the toes trapped past your armpit or ribs. A foot tucked flat against your ribs with the heel hidden has no handle on it.
  4. Take the grip with the bone of the wrist behind the heel and the forearm across the back of the ankle, hands joined and the whole grip pulled to your chest. A grip on the toes or the middle of the foot turns the foot at the ankle and spares the knee.
  5. Rotate with the hips and the upper body while the arms stay fixed to the chest. Turning with the arms alone opens the elbows and the heel slips; turning with the body moves the shin against a thigh that cannot move.
  6. Take the slack out first, then stop. The finish is the last few degrees of a slow turn, and in training the turn ends when the slack is gone, not when the partner is in pain.
  7. On the defensive side, hide the heel, turn the knee to point where the foot is pointing, and clear the knee line. A knee that follows the rotation is not being rotated against anything.

Common errors

  • Pulling on the heel with the knee already outside your thighs, which turns the whole leg and gives them the scramble on top.
  • Gripping the toes or the middle of the foot, which loads the ankle and lets the heel escape the handle.
  • Finishing with the arms instead of the body, which opens the elbows, loses the heel and tires the forearms for nothing.
  • Rotating quickly to beat the defence, which removes the only warning the partner was going to get.
  • Hand-fighting the grip while the knee stays pinned, on the defensive side, instead of clearing the knee line that the whole attack depends on.
  • Rolling against the turn to escape, which applies the rotation to your own knee faster than the attacker could.

Safety

A heel hook turns the knee of the person being attacked, and the joint gives little warning. A knee is a hinge held together by ligaments at its sides and its centre, and those ligaments are what resist a twist. A straight ankle lock loads the foot and the calf first, and the pain builds along a direction the partner can feel and answer. A heel hook loads the knee's ligaments directly and gives far less warning, so the tap has to come from position, not from sensation. Tap when the heel is caught and your knee is held, whatever it feels like. Whoever attacks has the greater duty: take the position, take the grip, take the slack out slowly, and treat the caught heel as the finished repetition in ordinary training. Never rotate quickly, never finish on a partner who has not agreed to heel hooks before the round, and never hold the turn to see whether they will tap. Whoever defends must not spin explosively out of a twist whose direction they have not identified, because rolling the wrong way does the attacker's work for them. If your knee has been turned hard, stop training on it and have it looked at rather than testing it in the next round.

Training progression

  1. Static: partner offers a leg, hands behind your back. Build the entanglement, close the hips, and turn the foot to expose the heel without touching it. Name where the knee line is.
  2. Cooperative: partner works the knee slowly out past your thighs while you follow with the hips and re-pinch. Grip nothing; the heel is off limits.
  3. Catch and release: with a coach's agreement and a partner of similar experience, take the heel grip, pull it to the chest, and let go. Nothing is turned; the repetition ends at the grip.
  4. Direction drill: from the grip, turn your body the smallest amount you can in the direction of the finish and stop, so both of you learn what the first degree of rotation feels like and where the tap belongs.
  5. Positional sparring under rules agreed aloud before the round: which heel hooks are in play, that the tap comes on the catch, and that the attacker stops on the tap or on any doubt. Swap roles every round.
  6. Live rounds, only where the room permits them, noting afterwards how often you reached for a heel while the knee was already outside your thighs.

Written material cannot correct your positioning, feel your pressure or stop a submission in time. Everything here is intended to make training with a qualified coach more useful, never to replace it.

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