Judo: Ashi Waza - Foot Sweep Biomechanics
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Standard Harai Tsurikomi Ashi·Kaze Uta Budo Kai / Windsong Dojo
Nick Lowry and Kyle Sloan talk about the biomechanics of a judo foot sweep. Nick explains the basic biomechanics of how/…
Standard Harai Tsurikomi Ashi
Genus払い釣り込み足(Harai Tsurikomi Ashi)
TraditionalTranslation: sweeping drawing ankle
Overview
Standard Harai Tsurikomi Ashi executes the classical lifting-pulling foot sweep where the thrower lifts the opponent onto their toes with the tsurite hand, pulls laterally with the hikite, and sweeps the loaded foot with the sole in a sideways arc. [1] The sweep contacts the opponent's ankle or lower shin and brushes it in the direction of the pull, toppling the opponent over the swept support. [1],[2] Proper execution requires the thrower to coordinate the lifting hand action with the sweep so that the opponent is maximally loaded on the target foot at the moment of contact. [2],[3]
History & Origin
Effectiveness
Harai tsurikomi ashi is effective because it combines active hand manipulation (tsurikomi) with the foot sweep, giving the thrower more control over the opponent's balance than a pure timing-dependent sweep. [1] The lifting-pulling action loads weight onto the target foot, making the sweep more reliable. [2]
Lineage
Harai tsurikomi ashi was classified in the Kodokan gokyo as a second-set technique, reflecting its position as a more advanced application of foot sweep mechanics combined with active hand control. [1]
Competition Record
The standard harai tsurikomi ashi is a regular technique in IJF competition. [1]
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Biomechanical Mechanism
Primary Action — Pulling and lifting with the arms to load the opponent over the shoulder or upper back
Joints Involved — Attacker's shoulders (loading point), elbows (pulling action), hips (turning under the opponent)
Force Vector — Forward and downward rotation — the pulling arm creates circular momentum while the body turns underneath
Kuzushi (Off-balancing) — Forward — breaking the opponent's balance forward over their toes allows the turning entry
Position & Entry
From judo grip — Use push-pull timing (kuzushi) to catch the opponent as they step, sweep the support foot in the direction of their movement
From clinch (collar tie) — Push or pull to make the opponent step, sweep the stepping foot at the exact moment it lifts off the mat
Variants
Forward sweep — sweeping the foot in the direction the opponent is stepping
Rear sweep — sweeping the foot backward as the opponent retreats
Combination sweep — chaining sweeps to both feet
Counter sweep — timing the sweep as the opponent initiates their own attack
Videos
Basic Judo throws and concepts
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Standard Harai Tsurikomi Ashi·Shintaro Higashi
Judo Basics. Here we cover the basic Judo positions and some basic throws and combinations. Osoto 1:24 Taio 1:30 Kenkay…
2 videos
What Instructors Say
Standard Harai Tsurikomi Ashi combines a foot sweep with a lifting action, and its effective execution depends critically on proper biomechanical sequencing. Kaze Uta Budo Kai emphasizes that the common error among learners is firing muscle groups in the wrong order—typically engaging the hip and knee before the ankle and toes—which severely limits the technique's applicability and power delivery. The correct sequence involves engaging the toes and ankle first, then the knee, and finally the hip, allowing the practitioner to generate force even when the opponent's weight is fully committed to the swept foot. This biomechanical approach, achieved through conscious practice, transforms the technique from one requiring perfect timing into a tool deployable across a wider range of situations and defensive postures. Shintaro Higashi provides complementary instruction on grip and body positioning fundamentals, emphasizing lapel control high on the collar to prevent the opponent from escaping underneath, combined with sleeve control to pin and dominate the arm. Both instructors underscore the importance of controlling posture and positioning before initiating the sweep, though Kaze Uta Budo Kai focuses specifically on the mechanical firing sequence that defines successful execution regardless of weight distribution, while Higashi prioritizes the grip configurations and stance work that establish the dominant position from which the technique can be applied.
Synthesized from 2 instructors
- Kaze Uta Budo Kai — Judo: Ashi Waza - Foot Sweep Biomechanics: Detailed biomechanical analysis of muscle-firing sequence (toe→ankle→knee→hip order) and explanation of how correct sequencing enables foot sweeps to work even when opponent has weight on the swept foot, doubling or tripling success opportunities
- Shintaro Higashi — Basic Judo throws and concepts: Foundational grip work and posture control principles applicable to throwing techniques including proper lapel positioning and sleeve control for dominant body positioning
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Ratings
Risk of injury to the person this technique is applied to
4
Moderate4/10
Foot sweeps use timing over force; lower impact but head strike risk remains
Skill level needed to execute this technique reliably
Advanced
Whether this technique is allowed under major competition rule sets
Restricted
— no leg attacks below waist
UWW International Wrestling Rules, January 2026PDFLegal
— IJF — Legal throwing technique
IJF Sport and Organisation Rules 2025, Article 27PDF— IBJJF — Legal at all belt levels
IBJJF Rules Book v6.0, June 2024PDF— Unified MMA — Legal throwing technique
Unified Rules of MMA, August 2025PDF— ADCC — Legal
ADCC Rules Update, April 2025PDF— FIAS Sport Sambo — Legal
FIAS International Sambo Competition RulesPDF— FIAS Combat Sambo — Legal
FIAS Combat Sambo RulesPDFTraining Notes
✓Grip the opponent's sleeve and lapel (or equivalent in no-gi)
✓Step forward and lift the opponent upward with both hands — pulling them onto the balls of their feet
✓As they rise, sweep their lead foot with the sole of your foot at ankle level
✓The lifting and sweeping must be perfectly synchronised — the foot leaves the ground because the body was lifted, and the sweep directs the fall
✓Drive the sweep through the ankle in the direction the opponent is moving
✓Continue the hand action through the throw, guiding the opponent to the mat
✓The throw should feel effortless when the timing is correct — if you are muscling it, the timing is off
Common Mistakes
!Lifting the opponent but sweeping too late — they resettle their weight and the foot is planted again
!Not lifting high enough — the opponent must be light on the target foot for the sweep to work
!Sweeping backward instead of in the direction the opponent is falling — the sweep must follow the kuzushi direction
!Using the instep instead of the sole of the foot for the sweep
!Releasing the grip during the throw and losing control of where the opponent lands
!Over-rotating the sweep so your own balance is compromised
!Not drilling the timing at slow speed first — this throw is all about the synchronisation of lift and sweep
Related Techniques
Counter Techniques
Lower Centre of Gravity — bend knees and drop hips to make the throw harder to executeLift the Targeted Leg — raise the foot being attacked above the sweeping actionCounter-Throw — exploit the attacker's committed weight to throw them insteadGrip Break — deny the thrower their preferred gripping configurationStiff-Arm — maintain distance with straight arms to prevent the entry
Setup Chain
1Grip Setup (Kumi-kata) — establish the controlling grips needed for the throw
2Off-Balance (Kuzushi) — break the opponent's balance in the throwing direction
3Entry (Tsukuri) — position the body for the throw by turning, stepping, or loading
4Execution (Kake) — complete the throwing action with full commitment and follow-through
Sources & References
Primary Source
Kodokan Judo — Official Nage-waza Classification
1BookKodokan Judo — Official Nage-waza Classification
Traditional Judo throwing technique terminology (Kodokan Institute)
Official Kodokan ground technique classification system
Standard Japanese martial arts terminology (kanji/hiragana)
4OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
5CitationKodokan Judo — Official Nage-waza Classification
Traditional Judo throwing technique terminology (Kodokan Institute)
Community
Athletics
Requires
precise timing, ankle coordination, upper body kuzushi ability
Favours
excellent balance and quick reflexes
Key muscles
tibialis anterior, calves, hip rotators, forearms (grip)
Frequently Asked Questions
What's the most common mistake beginners make when learning foot sweeps?
Beginners tend to rely only on ankle and hip action, letting the knee come in too late. Kaze Uta Budo Kai emphasizes that you must consciously point, curl, and bend the knee first, then engage the hip, to generate proper sweeping power.
Do I have to wait for perfect timing to make a foot sweep work?
No—if you build proper biomechanical structure into your sweep, you can execute it even when your opponent is flat-footed with weight down and actively resisting. Kaze Uta Budo Kai notes that understanding the correct sequencing of ankle, knee, and hip engagement allows the technique to work regardless of timing.
Why is it important to catch your opponent's foot when it's becoming weightless?
When executing a sweep with primarily ankle engagement, you need the opponent's foot to be just about weightless as you make contact so the sweep can function effectively. This is a key principle in foot sweep biomechanics according to Kaze Uta Budo Kai.
How does the Standard Harai Tsurikomi Ashi work?
Standard Harai Tsurikomi Ashi executes the classical lifting-pulling foot sweep where the thrower lifts the opponent onto their toes with the tsurite hand, pulls laterally with the hikite, and sweeps the loaded foot with the sole in a sideways arc. The sweep contacts the opponent's ankle or lower shin and brushes it in the direction of the pull, toppling the opponent over the swept support.
Where does the Standard Harai Tsurikomi Ashi come from?
The standard form of harai tsurikomi ashi has been part of Kodokan judo instruction since the early 20th century, valued as a technique that teaches students the integration of hand and foot actions. It remains a commonly scored technique in judo competition at all levels.
Is the Standard Harai Tsurikomi Ashi legal in competition?
IJF: legal — Legal throwing technique; IBJJF: legal — Legal at all belt levels; UWW: restricted — Legal in freestyle, banned in Greco-Roman (no leg attacks below waist); Unified MMA: legal — Legal throwing technique; ADCC: legal — Legal; FIAS Sport Sambo: legal — Legal; FIAS Combat Sambo: legal — Legal
How dangerous is the Standard Harai Tsurikomi Ashi?
Danger rating 4/10. Moderate — foot sweeps use timing over force; lower impact but head strike risk remains
How do I set up the Standard Harai Tsurikomi Ashi?
The standard setup chain: Grip Setup (Kumi-kata) → Off-Balance (Kuzushi) → Entry (Tsukuri) → Execution (Kake).
How do I defend against the Standard Harai Tsurikomi Ashi?
Standard counters include: Lower Centre of Gravity — bend knees and drop hips to make the throw harder to execute / Lift the Targeted Leg — raise the foot being attacked above the sweeping action / Counter-Throw — exploit the attacker's committed weight to throw them instead / Grip Break — deny the thrower their preferred gripping configuration.
What are the variants of the Standard Harai Tsurikomi Ashi?
Common variants: Forward sweep (sweeping the foot in the direction the opponent is stepping); Rear sweep (sweeping the foot backward as the opponent retreats); Combination sweep (chaining sweeps to both feet); Counter sweep (timing the sweep as the opponent initiates their own attack).
How effective is the Standard Harai Tsurikomi Ashi in competition?
The standard harai tsurikomi ashi is a regular technique in IJF competition.
What are common mistakes when doing the Standard Harai Tsurikomi Ashi?
Top errors to watch for: Lifting the opponent but sweeping too late — they resettle their weight and the foot is planted again / Not lifting high enough — the opponent must be light on the target foot for the sweep to work / Sweeping backward instead of in the direction the opponent is falling — the sweep must follow the kuzushi direction / Using the instep instead of the sole of the foot for the sweep.
What are other names for the Standard Harai Tsurikomi Ashi?
The Standard Harai Tsurikomi Ashi is also known as Harai Tsurikomi Ashi, Classical Lifting Pulling Foot Sweep, Standard Sweeping Drawing Ankle Throw.