Hammer Fist to Setup the KICK!
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Hammer Fist·TeachMeGrappling Coach Brian
This video Majid demonstrates a hammer fist that you can use as a strike or a grab to setup a kick to the face. Check o…
Hammer Fist
Family鉄槌打ち(Tettsui-uchi)
TraditionalTranslation: hammer fist
Overview
History & Origin
The hammer fist (tetsui uchi in Japanese) is one of the most instinctive striking techniques, using the bottom of the closed fist in a hammering motion. [1] Nakayama documented the hammer fist as tetsui uchi in Best Karate, noting that it was one of the oldest striking techniques in karate and appeared in the earliest Okinawan kata. [2] The hammer fist's ergonomic advantage — striking with the dense metacarpal bones rather than the fragile knuckles — made it a preferred technique in systems where bare-knuckle striking was standard. [1] In MMA, the hammer fist became prominent as a ground-and-pound weapon, particularly from mount and guard positions where conventional punches risk wrist injury. [3]
Effectiveness
Lineage
Hammer fists are found in many martial arts and are particularly effective in MMA ground-and-pound. [1]
Competition Record
Hammer fists are one of the most commonly used ground strikes in MMA. [1]
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Biomechanical Mechanism
Primary Action — Ballistic extension of the arm — kinetic chain transfers force from the ground through the hips to the fist
Joints Involved — Shoulder (flexion/rotation), elbow (rapid extension), wrist (stabilised on impact), hips (rotation)
Force Vector — Linear (jab, cross) or circular (hook, overhand) depending on the punch type
Kinetic Chain — Ground reaction force → hip rotation → torso rotation → shoulder extension → fist impact — each link amplifies velocity
Position & Entry
From fighting stance — Establish guard, generate force through hip rotation and weight transfer, extend the striking arm to the target
As combination (after setup) — Follow a jab or feint with the punch to exploit the opening created
As counter — Time the punch to land as the opponent commits to their own attack
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
5
High5/10
Fleshy fist edge strike; common in ground-and-pound
Skill level needed to execute this technique reliably
Beginner
Whether this technique is allowed under major competition rule sets
Illegal
WBC/Boxing — Only closed-fist punches permitted {src— WBC Rules of Boxing}
Kyokushin — Only closed-fist strikes to body permitted {src— IKO Kyokushin Tournament Rules}
— WT — Prohibited
WT Competition Rules 2024PDF— WAKO — Closed fist only
WAKO Competition RulesPDFK-1/GLORY — Closed fist only {src— K-1/GLORY Kickboxing Rules}
Restricted
— WKF — Varies by technique — some open-hand strikes legal ...
WKF Competition Rules 2024PDF— ITF — Some knife hand techniques legal
ITF Competition RulesPDFLegal
— palm strikes, slaps permitted
Unified Rules of MMA, August 2025PDF— IFMA — Legal — palm strikes permitted in Muay Thai
IFMA Muay Thai RulesPDFTraining Notes
✓The hammer fist strikes with the bottom of the closed fist — the fleshy pad below the little finger
✓Swing the fist in a downward, horizontal, or diagonal arc like swinging a hammer
✓The hammer fist is one of the safest strikes for the attacker because the impact area is padded and the wrist stays aligned
✓It is a primary ground-and-pound weapon in MMA — from mount or guard, hammer fists can be thrown repeatedly without wrist injury risk
✓The hammer fist is also effective standing: as a downward strike to the top of the head, or horizontal to the temple
✓No hand wraps or gloves are needed — the hammer fist is a bare-hand striking technique used in self-defence
✓In MMA, fighters like Mark Hunt and Fedor Emelianenko used devastating ground-and-pound hammer fists to finish opponents
Common Mistakes
!Hitting with the knuckle side of the fist instead of the bottom pad — this negates the safety advantage
!Swinging too wide and losing accuracy — the hammer fist should follow a controlled arc
!Not using the shoulder and core to power the strike — arm-only hammer fists lack force
!Throwing hammer fists from outside range where a punch would be more effective
!Not maintaining position during ground-and-pound — the priority is control first, strikes second
!Using the hammer fist at a flat angle where it bounces off the guard — aim for gaps and angles
!Winding up visibly before striking, giving the opponent time to cover or escape
Related Techniques
Counter Techniques
Setup Chain
1Assume Fighting Stance — begin from a balanced position with guard up
2Generate Power — use hip rotation and weight transfer for maximum force
3Execute Strike — deliver the technique to the target with correct form
4Recover to Guard — return immediately to defensive position
Sources & References
Primary Source
Karate-Do Kyohan: The Master Text (Gichin Funakoshi, 1935)
1BookKarate-Do Kyohan (Funakoshi, 1935)
Alias sources — [1] Dynamic Karate (Nakayama, 1966) [2] Dynamic Karate (Nakayama, 1966) [3] Dynamic Karate (Nakayama, 1966)
2BookMastering Jujitsu (Gracie & Danaher, 2003)
History sources — [1] The Art of Striking (Blauer, 2004) [2] Best Karate Vol. 3 (Nakayama, 1978) [3] Ultimate MMA Conditioning (Jamieson, 2009)
Official karate technique names (和語/漢語)
4OtherJapanese Martial Arts Standard Terminology (武道用語)
Established Japanese martial arts naming convention — native Japanese term (和語/漢語)
5CitationKarate-Do Kyohan (Funakoshi, 1935)
Alias sources — [1] Dynamic Karate (Nakayama, 1966) [2] Dynamic Karate (Nakayama, 1966) [3] Dynamic Karate (Nakayama, 1966)
6CitationMastering Jujitsu (Gracie & Danaher, 2003)
History sources — [1] The Art of Striking (Blauer, 2004) [2] Best Karate Vol. 3 (Nakayama, 1978) [3] Ultimate MMA Conditioning (Jamieson, 2009)
Community
Athletics
Requires
hand speed, hip rotation, wrist alignment on impact
Favours
proportional reach, strong wrists, fast-twitch shoulder muscles
Key muscles
deltoids, pectorals, triceps, core rotators, forearms
Sub-techniques
Downward Hammer Fist
SubFamilyA hammer fist driven straight downward onto the target, commonly used in ground-and-pound positions or against a bent-over opponent.
1 genera·1 techniquesExplore
Horizontal Hammer Fist
SubFamilyA hammer fist swung in a horizontal or lateral arc, using the bottom of the fist to strike the temple or side of the head in a sweeping motion.
1 genera·1 techniquesExplore
Notes
The hammer fist appears in 156 passages across 39 books. Uses the bottom of the closed fist in a swinging motion — like swinging a hammer. The safest striking surface (lowest self-injury risk). Dominant ground-and-pound weapon in MMA because there is no risk of breaking knuckles on the skull. (39 books; MMA training manuals)
Frequently Asked Questions
How can I use the hammer fist to set up other techniques?
Coach Brian from TeachMeGrappling demonstrates using the hammer fist as part of a combination to open up kicks and other strikes. The sequence typically flows from a jab into the hammer fist, which then leads into your next offensive move.
What's the difference between throwing a traditional hammer fist and using it in combination?
Instead of throwing a traditional hammer fist in isolation, Coach Brian emphasizes throwing a jab first, then bringing the hammer fist back as a strike, which also sets you up for a grab or follow-up technique.
How does the Hammer Fist work?
A strike delivered with the bottom of the closed fist (the ulnar side), swinging the fist in a downward or horizontal arc like a hammer.
Where does the Hammer Fist come from?
The hammer fist (tetsui uchi in Japanese) is one of the most instinctive striking techniques, using the bottom of the closed fist in a hammering motion. Nakayama documented the hammer fist as tetsui uchi in Best Karate, noting that it was one of the oldest striking techniques in karate and appeared in the earliest Okinawan kata.
Is the Hammer Fist legal in competition?
Unified MMA: legal — Legal (palm strikes, slaps permitted); WBC/Boxing: banned — Only closed-fist punches permitted; WKF: restricted — Varies by technique — some open-hand strikes legal in kata, generally restric…; Kyokushin: banned — Only closed-fist strikes to body permitted; WT: banned — Prohibited; ITF: restricted — Some knife hand techniques legal; WAKO: banned — Closed fist only; K: banned — 1/GLORY — Closed fist only; IFMA: legal — Legal — palm strikes permitted in Muay Thai
How dangerous is the Hammer Fist?
Danger rating 5/10. High — fleshy fist edge strike; common in ground-and-pound
How do I set up the Hammer Fist?
The standard setup chain: Assume Fighting Stance → Generate Power → Execute Strike → Recover to Guard.
How do I defend against the Hammer Fist?
Standard counters include: Block — absorb the strike with a protective guard position / Evasion — move the target out of the strike's path / Counter-Attack — time an offensive response during the recovery phase of the strike.
What are the variants of the Hammer Fist?
Common variants: Overhead hammer fist (bringing the fist straight down onto the target from above); Side hammer fist (swinging horizontally using the bottom of the fist); Ground-and-pound hammer fist (delivered from mount or top position on the ground).
How effective is the Hammer Fist in competition?
Hammer fists are one of the most commonly used ground strikes in MMA.
What are common mistakes when doing the Hammer Fist?
Top errors to watch for: Hitting with the knuckle side of the fist instead of the bottom pad — this negates the safety advantage / Swinging too wide and losing accuracy — the hammer fist should follow a controlled arc / Not using the shoulder and core to power the strike — arm-only hammer fists lack force / Throwing hammer fists from outside range where a punch would be more effective.
What are other names for the Hammer Fist?
The Hammer Fist is also known as Tettsui-uchi, Tetsui Uchi, Fist Hammer, Bottom Fist.