ANATOMY OF KARATE HANDS AND FEET TECHNIQUES PART - I | KYOKUSHIN VLOG-29
0
Nihon Ken·Kyokushin Society
ANATOMY OF KARATE HANDS AND FEET TECHNIQUES PART - I Welcome back to another Kyokushin Society Vlog where we discuss k…
Nihon Ken
SubFamily二本拳(Nihon Ken)
TraditionalTranslation: two-knuckle fist
Overview
Nihon Ken is a karate striking technique using the extended middle and index finger knuckles as the impact surface. [1] The hand forms a partial fist with the index and middle fingers extended at the second knuckle joint, creating two protruding points that concentrate force into a narrow striking area. [1] This formation allows precise targeting of vulnerable areas such as the philtrum (upper lip groove), the space between the eyes (nasion), and the throat — areas too small for a standard seiken fist to effectively target. [1] Like ippon ken (single-knuckle fist), nihon ken requires extensive knuckle conditioning through makiwara and sand bag training to prevent self-injury. [1]
Nihon-KenTwo Knuckle FistFore-Knuckle FistDouble Knuckle Strike
History & Origin
Nihon ken is documented in traditional Okinawan and Japanese karate as one of several specialized fist formations alongside ippon ken and hiraken. [1] It appears in the striking curriculum of Shotokan, Goju-Ryu, and Kyokushin styles, typically taught at intermediate to advanced levels after basic fist conditioning is established. [1]
Effectiveness
A precision weapon for attacking vulnerable soft-tissue targets that a standard fist cannot isolate. [1] The two-point contact concentrates force into a very small area, creating disproportionate pain on nerve clusters and pressure points. More stable than ippon ken due to the wider two-knuckle base, but less precise. Primarily a self-defense and traditional training technique — not practical in sport competition. [1]
Competition Record
Used in WKF karate kumite (controlled contact) and Kyokushin full-contact competition. Banned in boxing, TKD, and most kickboxing rulesets. Appears in MMA where legal. [1]
Images
No images yet for this technique.
Sign in to suggest an image.
Biomechanical Mechanism
Primary Action — Index and middle finger knuckles protrude from a partially closed fist, driven forward with hip rotation and arm extension
Joints Involved — Metacarpophalangeal joints of index and middle fingers (extended and locked), wrist (rigid alignment), elbow (extension), shoulder (drive)
Force Vector — Linear — straight forward with body weight behind the two protruding knuckles
Striking Surface — Proximal interphalangeal joints of index and middle fingers — two-point contact concentrates force into approximately 3 cm²
Position & Entry
From fighting stance — Drive nihon ken straight to philtrum or bridge of nose with reverse-hand mechanics
From clinch range — Short nihon ken to throat or under the chin
As counter — After blocking an incoming punch, nihon ken to exposed temple
Variants
Vertical nihon ken — knuckles aligned vertically for narrow targets like the philtrum
Horizontal nihon ken — knuckles aligned side-by-side for wider targets like the bridge of the nose
Rising nihon ken — upward strike under the chin
Thrusting nihon ken — straight drive to the throat
Videos
1 video
Learn This Technique
No instructional courses yet for this technique.
Sign in to suggest a course.
Ratings
Risk of injury to the person this technique is applied to
7
Very High7/10
Concentrated two-point impact to soft tissue targets (throat, eyes) can cause serious injury. Self-injury risk to unconditioned knuckles.
Skill level needed to execute this technique reliably
Advanced
Whether this technique is allowed under major competition rule sets
Illegal
WKF Karate— Not permitted — only standard closed fist and controlled ...
WKF Kumite Rules 2026PDFUnified MMA— Technically legal as a punch but impractical with gloves
Unified Rules of MMA, August 2025PDFOlympic Karate— Not permitted
WKF Kumite Rules 2026PDFLegal
Kyokushin
Training Notes
✓Condition knuckles gradually on makiwara before full-force use — unconditioned knuckles will fracture
✓The two extending fingers must be locked rigidly at the second joint — any flex absorbs impact and risks finger injury
✓Practice on padded targets first, then sand bags, then makiwara
✓Wrist must remain perfectly aligned with the forearm — any bend transfers force into the wrist
Common Mistakes
!Insufficient knuckle conditioning — leads to fractures on hard targets
!Loose finger lock — the extending knuckles fold on impact, injuring the fingers
!Poor wrist alignment — force transfers into the wrist instead of the target
!Using against padded areas — nihon ken is designed for soft-tissue and pressure-point targets only
Related Techniques
Counter Techniques
Setup Chain
1Inside block (uchi uke) → deflect punch → immediate nihon ken to philtrum
2Grab opponent's lapel → pull forward → nihon ken to space between eyes
3Sweep front leg → opponent stumbles → nihon ken to exposed throat
Sources & References
Primary Source
Oyama, M. This Is Karate / Essentials of Karate.
1BookOyama, M. This Is Karate / Essentials of Karate.
[1] Oyama / Funakoshi / Nakayama, Karate technique manuals — hand formation and striking surface chapters
2BookFunakoshi, G. Karate-Do Kyohan.
3BookNakayama, M. Best Karate Series.
Official karate technique names (和語/漢語)
5OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
6CitationOyama, M. This Is Karate / Essentials of Karate.
[1] Oyama / Funakoshi / Nakayama, Karate technique manuals — hand formation and striking surface chapters
7CitationFunakoshi, G. Karate-Do Kyohan.
8CitationNakayama, M. Best Karate Series.
Community
Athletics
Requires
extensive knuckle conditioning (months of makiwara training), precise finger lock, strong wrist alignment
Favours
thick knuckle structure, strong forearm musculature
Key muscles
forearm flexors (fist compression), finger extensors (knuckle lock), wrist stabilizers (alignment), triceps (drive)
Notes
Nihon ken (two-knuckle fist) uses two extended knuckles — broader than ippon ken but still concentrated for precision striking. Targets the philtrum, nasion, and other small vulnerable areas. (Oyama, This Is Karate; Nakayama, Dynamic Karate)
Frequently Asked Questions
Should I learn weapons before mastering basic hand and foot techniques?
No. According to Kyokushin Society, you should master proper punches, kicks, and hand/foot conditioning before training with weapons like bostaf, nunchucks, or sai. Once your hand and feet techniques are mastered properly, they become your main weapons, and only then should you start practicing with external weapons.
How do I prevent hand and bone damage when striking and blocking?
Kyokushin Society emphasizes that you must harden the surfaces of your hands and feet—specifically your hand knuckles and shin bones—through proper conditioning so that when you defend or retaliate, your bones will not get damaged.
Why is keeping my wrist straight important when punching?
Keeping your wrist straight enables you to transmit the maximum amount of force on impact, as explained in Kyokushin Society's technique breakdown.
How does the Nihon Ken work?
Nihon Ken is a karate striking technique using the extended middle and index finger knuckles as the impact surface. The hand forms a partial fist with the index and middle fingers extended at the second knuckle joint, creating two protruding points that concentrate force into a narrow striking area.
Where does the Nihon Ken come from?
Nihon ken is documented in traditional Okinawan and Japanese karate as one of several specialized fist formations alongside ippon ken and hiraken. It appears in the striking curriculum of Shotokan, Goju-Ryu, and Kyokushin styles, typically taught at intermediate to advanced levels after basic fist conditioning is established.
Is the Nihon Ken legal in competition?
WKF Karate: Not permitted: banned — only standard closed fist and controlled techniques allowed; Unified MMA: Technically legal as a punch but impractical with gloves {src:Unified Rules of MMA, August 2025|/sources/Unified: banned — MMA-Rules-August-2025.pdf}; Olympic Karate: Not permitted {src:WKF Kumite Rules 2026|/sources/WKF: banned — Kumite-Rules-2026.pdf}; Kyokushin: Permitted in bare: legal — knuckle formats
How dangerous is the Nihon Ken?
Danger rating 7/10. High — concentrated two-point impact to soft tissue targets (throat, eyes) can cause serious injury. Self-injury risk to unconditioned knuckles.
How do I set up the Nihon Ken?
The standard setup chain: Inside block (uchi uke) → deflect punch → immediate nihon ken to philtrum → Grab opponent's lapel → pull forward → nihon ken to space between eyes → Sweep front leg → opponent stumbles → nihon ken to exposed throat.
How do I defend against the Nihon Ken?
Standard counters include: Distance management — nihon ken requires precise close range / Forearm block — deflect the hand offline before the knuckles contact / Body movement — even small shifts negate the precision-dependent strike.
What are the variants of the Nihon Ken?
Common variants: Vertical nihon ken (knuckles aligned vertically for narrow targets like the p…); Horizontal nihon ken (knuckles aligned side-by-side for wider targets like the …); Rising nihon ken (upward strike under the chin); Thrusting nihon ken (straight drive to the throat).
How effective is the Nihon Ken in competition?
Used in WKF karate kumite (controlled contact) and Kyokushin full-contact competition. Banned in boxing, TKD, and most kickboxing rulesets.
What are common mistakes when doing the Nihon Ken?
Top errors to watch for: Insufficient knuckle conditioning — leads to fractures on hard targets / Loose finger lock — the extending knuckles fold on impact, injuring the fingers / Poor wrist alignment — force transfers into the wrist instead of the target / Using against padded areas — nihon ken is designed for soft-tissue and pressure-point targets only.
What are other names for the Nihon Ken?
The Nihon Ken is also known as Nihon Ken, Nihon-Ken, Two Knuckle Fist, Fore-Knuckle Fist, Double Knuckle Strike.