Ko Uchi GariHow it works and how to improve it

01 / AT A GLANCE

A small action still needs a real threat

Ko-uchi-gari is the minor inner reap, an ashi-waza. In the right-sided reference, tori uses the sole of the right foot to reap uke’s right heel from inside while directing uke backward. The short leg action does not mean the whole technique is a casual tap. If uke has no reason to move, the supposed setup for your next throw may be imaginary.

Convention: tori is you, uke is your partner. Your left hand holds uke’s right sleeve and your right hand holds uke’s left lapel. Your left foot supports the action and your right foot attacks the inside of uke’s right heel. Keep that relationship explicit when comparing it with o-uchi-gari, whose baseline right leg attacks uke’s left leg.

“Kouchi gari,” “ko uchi gari” and “ko-uchi-gari” are common spellings. Ko-uchi-makikomi is a separately recognised sacrifice technique, not simply a stronger version of this standing reap. A lunging or wrapping finish should be taught and named appropriately rather than added whenever the small action stalls.

This page is for supervised practice with ukemi. It focuses on timing, connection and reaction recognition. Beginners can use it to understand the heel relationship; more experienced judoka can use it to test whether their first attack genuinely creates the shoulder-throw opportunity they expect.

02 / WATCH THE TECHNIQUE

Watch the heel and the shoulder together

The Kodokan video establishes the reference action. Efficient Judo’s clip is a concise demonstration, not a complete spoken lesson. Watch the point of contact and the upper-body direction in separate passes before trying to combine them into one picture.

First, identify which heel is attacked and from which side. Second, look at uke’s posture and support just before contact. Third, follow the hands during the reap. If your attention stays on the foot, you may miss why uke can or cannot simply recover the leg.

For a connected sequence, see Efficient Judo’s ko-uchi-gari to ippon-seoi-nage demonstration. Study the recovery between the attacks, not only the two final shapes. A useful question is whether the backward threat brings uke forward into the next entry while the sleeve remains controlled.

When analysing your own clip, begin several steps before the attack. Record whether the heel was available, whether the grip moved the upper body and whether uke reacted. A missed heel, a real attack that was defended and a token foot tap are different outcomes and should not be grouped as one failed ko-uchi.

03 / WHEN TO USE IT

Recognise a heel you can actually affect

A step brings the right foot within range

A moving partner may place the heel where a short inside action is available. Your support and upper-body connection must arrive at the same time. If the foot is already withdrawing while you reach for it, chasing the heel can make you fall forward without threatening uke’s balance.

Uke settles backward against a forward threat

Resistance to a shoulder or turning attack may bring uke’s weight toward the rear. If you can recover a facing stance and keep a usable grip, that response may offer ko-uchi. If your back is still underneath uke or your feet are crossed, restore position before attempting the rearward attack.

Same-sided and opposite-sided approaches

The right-sided heel relationship may be easier to recognise in a familiar same-sided grip. Opposite leads change the reachable foot and the path of your attacking leg. Work on that approach with the coach; do not simply kick farther across your own support to reach the expected target.

A partner who anticipates the tap

If uke ignores your ko-uchi because it never moves their body, adding more feints may not help. Practise completing the first attack under controlled conditions. The threat should be credible enough that uke’s recovery is a choice, not a rehearsed response performed to help your combination look smooth.

04 / HOW IT WORKS

Make a short reap part of a whole-body action

Bring the rearward line into the grip

Use the sleeve and lapel to organise uke’s upper body toward the intended rear corner. The hands should work with the partner’s movement. A foot action below a freely moving torso may make contact without removing a meaningful support.

Move your support within reach

Place the left support so the right foot can reach the inside of uke’s right heel without a long lunge. Keep enough balance to return the attacking foot if the target disappears. If you can only touch the heel by leaning on uke, inspect the approach distance before working on foot speed.

Reap the heel with controlled contact

Use the sole of the right foot in the coached contact relationship and direction. The action should remove the heel’s support rather than kick the shin or twist the knee. Begin slowly enough for uke to describe the contact. Exact timing relative to a step needs practical coaching; the page does not prescribe one universal instant for every moving variation.

Continue the upper-body direction

The hands and torso carry the rearward threat as the heel is removed. Do not stop your grip action as soon as the foot touches. Conversely, avoid a heavy forward collapse if the heel has escaped. The technique should retain a controlled route into the fall or back to stance.

Finish or recover

If uke remains available, complete the coached throw and support the landing. If they withdraw the foot, return to stable support and inspect the new position. That recovery may offer a forward throw, but it may also create too much distance. The next decision belongs to the changed relationship, not a memorised sequence.

05 / KEY POINTS

Five checks for a meaningful small attack

• Reach the heel without chasing it. In a slow drill, can you withdraw your attacking foot and remain balanced when uke removes the target? If not, improve distance and support.
• Move the upper body with the foot. Ask whether uke feels a genuine rearward threat or only contact at the ankle. The answer helps separate connection from accuracy.
• Use controlled contact. A kick to the shin is not a stronger reap. Reset if contact is painful or the action twists a fixed joint.
• Let the first attack finish when it can. Do not abandon a successful ko-uchi merely because the planned sequence contains a shoulder throw. The partner’s response decides.
• Notice the recovery direction. After uke removes the heel, are they coming forward into range or moving farther away? Practise naming that difference before adding speed.

Choose a short block in which only one of these checks is being improved. Once the foot reliably finds the heel, stop using accuracy drills as a substitute for learning the reaction. Once the reaction is clear, test it with a partner who can choose not to give it. If uke reports a genuine rearward threat but the heel still slips away, return to the first check before changing the hands; if the heel is reached but uke feels only contact, the second check is the more likely gap.

06 / PROBLEMS & ADJUSTMENTS

Why does the setup produce no opening?

07 / SETUPS & COMBINATIONS

Two directions, three possible decisions

08 / DEFENCES & COUNTERS

Recover the heel and the posture together

For uke, early defence includes moving the target foot while preserving a stable upper-body position. A large panicked step may avoid the reap but carry the shoulder directly into the next attack. Practise a modest recovery under a coach’s supervision, then learn to recognise the opponent’s continuation.

Ko-uchi-gaeshi is a separate recognised counter. Its presence in the official list does not mean every leg withdrawal is a counter or that an uncontrolled fall is an acceptable way to resist. Learn the specific action separately before adding it to live combination work.

When the rearward fall is committed, take ukemi. Do not plant a straight arm behind you or twist a trapped leg to prevent the score in a training drill. Tori should keep landing control and stop when contact or posture becomes unsafe.

For tori, the main exposure is overreaching at a small target while losing the upper body. An opponent can exploit that imbalance even if your foot touched the heel. Use recovery repetitions deliberately: remove the attacking foot, restore stance and see the new situation before choosing another technique.

09 / GROUND TRANSITIONS

A small reap can leave several ground positions

Uke falls and you remain above

Keep useful sleeve contact while finding a stable side position. Kesa-gatame may be available if the near arm and upper body can be controlled. Avoid falling on top without knowing where your legs are; a fast reap can still leave a messy landing if the follow-through is uncontrolled.

Your leg is between uke’s legs

Treat the next task as passing or freeing the leg while maintaining top control. Do not claim a pin merely because uke is on their back. A coach-selected pass can lead toward yoko-shiho-gatame once the legs are clear and the torso is controlled.

Uke turns onto the side and frames

Control the space and inspect the near elbow and knee. Rushing around the head may leave the hips free to recover. Practise a short positional round from that exact arrival, with the objective of establishing side control rather than collecting another technique name.

The attack produces only a step

If both partners remain standing, the continuation may still be tachi-waza. Do not manufacture a ground attack by collapsing after a missed heel. Your record should distinguish a throw, a useful reaction and an attack that did not change the position.

10 / PRACTICE PROGRESSION

Train the heel, then the decision

Contact without a throw

Use the coached grip and a cooperative stance. Place the attacking foot into the correct heel relationship and return to support. Check comfort, accuracy and posture. Stop if the exercise becomes shin kicking or joint twisting. This stage establishes contact; it does not yet prove you can time a moving opponent.

One predictable step

Uke walks a simple pattern at an easy pace. Tori identifies the reachable heel and coordinates the rearward upper-body action. A coach supervises any complete throws. Record whether misses came from distance or timing so the next adjustment has a clear purpose.

Complete the first attack

Give ko-uchi a block in which it is the intended finish, not merely a prelude. This prevents a habit of withdrawing the attack as soon as contact occurs. Progress when uke needs a real defensive response under modest, agreed resistance.

Read the recovery

Uke chooses between remaining available backward, recovering forward and retreating farther. Initially use only two of these options, then add the third. Tori finishes, selects the trained forward throw or resets. Count correct decisions separately from successful throws.

Transfer to randori

Use short rounds where your objective is a credible ko-uchi threat and a sensible response, not a compulsory combination. Ask your partner which attempts actually moved their balance. If they ignore most of them, work on the first attack; if they react but you choose poorly, work on recognition rather than foot accuracy.

If obtaining the starting grip is the limiting step, use the grip-fighting drills guide to work on that approach before increasing throwing repetitions.

11 / COMPETITION EXAMPLE

Fonseca’s second score in the 2021 world final

The IJF report “A Dance and a Tear of Joy” describes Jorge Fonseca’s −100 kg world final against Aleksandar Kukolj in Budapest in 2021. It identifies a first score with sode-tsurikomi-goshi and a second with ko-uchi-gari through an action–reaction sequence. The report supports that sequence-level example; exact grip and heel timing are not independently analysed here.

The study question is how a forward threat and a backward attack relate within one contest. Do not assume the decisive action happened immediately after the earlier scoring throw. Watch the intervening exchanges in an official replay and record the actual response that preceded the ko-uchi.

Use the IJF ko-uchi-gari library for further cases. Compare attempts that produce a score with attempts that only provoke movement. Both can be tactically useful, but a small sample does not justify a universal claim that ko-uchi is always best used as a setup.

12 / VARIATIONS & COMPARISONS

Reap, wrap and neighbouring inside attack

Ko-uchi-gari is the standing minor inside reap described here. Ko-uchi-makikomi is a distinct recognised sacrifice technique with a wrapping action. Do not let a failed standing reap drift into a falling wrap without instruction and then count it as the same drill.

O-uchi-gari changes the attacked leg and the scale and path of the inside action. Ko-soto-gari attacks from outside. Similar-looking foot contact can belong to different techniques, so describe the side of contact, target and direction rather than relying on the size of the movement alone.

The same ko-uchi can be a finishing attack or a way to elicit recovery. Those are tactical roles, not different official techniques. A credible finishing threat often improves the usefulness of the setup, but whether it suits your game depends on the grips and reactions you can actually obtain.