MUAY THAI Flying Knee - Jumping Knee
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Khao Loi·Ironboy Experience
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Translation: flying knee
Range & classification
Category
Strike & defenceLocksClose rangeFighting multiple people
Distance
CloseMiddleLong
Limb angle
Zero180–135°135–90°90–45°45–0°
Body target
Upper bodyMiddle bodyLower body
Overview
History & Origin
Khao Loi (เข่าลอย), literally 'floating knee' in Thai, is the traditional Muay Thai name for the flying knee strike. [1] Kraitus and Rennehan document Khao Loi as one of the most revered techniques in the Muay Thai tradition, considered a 'fight-ending' weapon that demonstrates both courage and technical mastery. [1] The technique was a signature move of legendary Muay Thai fighters in the golden era of stadium fighting (1980s-1990s), and its successful execution was considered a mark of elite skill. [2] Delp notes that Khao Loi requires precise timing and explosive athleticism, as the fighter must launch the entire body weight behind the knee strike. [2]
Country of origin· shown in random order
- Thailand— flying kneeMuay Thai
- BrazilMMA
- USAMMA, Kickboxing
- MyanmarLethwei
- JapanKickboxing
Effectiveness
Khao loi (flying knee) is one of the most dramatic and devastating techniques in Muay Thai. [1]
Lineage
A traditional Muay Thai flying technique. [1]
Competition Record
The flying knee has produced iconic finishes in Muay Thai and MMA. [1]
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Biomechanical Mechanism
Primary Action — Driving the knee upward or diagonally into the target using hip flexion and body weight
Joints Involved — Hip (powerful flexion drive), knee (point of impact, flexed), core (posture and power transfer)
Force Vector — Upward (straight knee to body/head), diagonal (round knee from the side), or clinch-pull driven
Clinch Integration — Most effective when combined with clinch control — pulling the opponent's head down into the rising knee multiplies impact force
Position & Entry
From outside range (running or stepping) — Take an explosive forward step, jump off the lead foot, chamber and extend the kick while airborne
As surprise attack — Close distance rapidly with a leap, launch the kick at the apex of the jump
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
8
Very High8/10
Airborne knee strike; devastating KO potential (numerous UFC finishes)
Skill level needed to execute this technique reliably
Advanced
Whether this technique is allowed under major competition rule sets
Illegal
WBC/Boxing — All knee strikes prohibited {src— WBC Rules of Boxing}
— WKF — Prohibited in sport karate
WKF Competition Rules 2024PDF— WT — Prohibited
WT Competition Rules 2024PDF— ITF — Prohibited
ITF Competition RulesPDF— WAKO — Prohibited in most formats
WAKO Competition RulesPDFRestricted
— Unified MMA — Knees to standing opponent legal, knees to ...
Unified Rules of MMA, August 2025PDFK-1/GLORY — One clinch knee allowed before referee break {src— K-1/GLORY Kickboxing Rules}
Legal
Kyokushin — Legal to body {src— IKO Kyokushin Tournament Rules}
— IFMA — Legal — knees are a core Muay Thai weapon, clinch ...
IFMA Muay Thai RulesPDFTraining Notes
✓Khao loi is the Muay Thai flying knee — a leaping knee strike that is one of the sport's most revered techniques
✓Drive off the rear foot and leap forward, pulling the striking knee upward toward the opponent's chin or chest
✓The arms can grip the opponent's head in flight to pull them into the knee for added impact
✓Khao loi requires commitment — once airborne, there is no changing the trajectory
✓Set up the khao loi by pressuring the opponent backward with combinations until they are moving in a straight line away from you
✓In Muay Thai stadium scoring, a clean khao loi is considered one of the highest-impact techniques and impresses judges significantly
✓Dieselnoi Chor Thanasukarn was legendary for his devastating khao loi from the clinch
Common Mistakes
!Leaping without committing — a half-jump produces a weak, floating knee
!Not pulling the opponent's head into the knee when gripping is possible — the collision doubles the force
!Jumping straight up instead of forward — horizontal momentum is the key to the khao loi's power
!Landing flat-footed after the leap, jarring the body and preventing follow-up
!Throwing the khao loi when the opponent is pressuring forward — they will smother the knee or clinch you in the air
!Not setting up the leap with forward pressure — the khao loi works best against a retreating opponent
!Dropping the guard during the leap and eating a punch on the way in
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
Muay Thai: The Art of Fighting (Yod Ruerngsa, Khun Kao Charuad & James Cartmell, 2002)
1BookTaekwondo (Choi, 1965)
Alias sources — [1] Muay Thai Unleashed (Delp, 2006) [2] Muay Thai: The Art of Fighting (Kraitus & Kraitus, 1988) [3] Dynamic Karate (Nakayama, 1966)
2BookMuay Thai: The Art of Fighting (Kraitus, 2002)
History sources — [1] Muay Thai: The Art of Fighting (Kraitus & Rennehan, 2002) [2] Muay Thai Unleashed (Delp, 2006)
3OtherJapanese Combat Sports Katakana Convention
Standard katakana transliteration of Western martial arts terminology (外来語) — used in Japanese MMA, boxing, and BJJ communities
4CitationTaekwondo (Choi, 1965)
Alias sources — [1] Muay Thai Unleashed (Delp, 2006) [2] Muay Thai: The Art of Fighting (Kraitus & Kraitus, 1988) [3] Dynamic Karate (Nakayama, 1966)
5CitationMuay Thai: The Art of Fighting (Kraitus, 2002)
History sources — [1] Muay Thai: The Art of Fighting (Kraitus & Rennehan, 2002) [2] Muay Thai Unleashed (Delp, 2006)
Community
Athletics
Requires
hip flexion power, clinch control ability, close-range comfort
Favours
long thigh for greater leverage, strong hip flexors
Key muscles
hip flexors, quadriceps, core, grip (for clinch)
Sub-techniques
Find by what a technique does — not its name
Every move, in any martial art, shares a few universal traits. Mix and match below to pinpoint the right tool — or compare equivalents across styles.
Category
Distance
Limb angle
Body target
Frequently Asked Questions
What's the most common mistake when performing a flying knee?
Leaning back is the biggest error—it causes you to lose balance and fall backwards. Instead, keep your head between your legs and extend your hip forward to maintain control in the air.
How do I practice the flying knee safely?
Use a teardrop bag if possible, make sure you have enough ceiling height, and most importantly, land with control and balance to avoid injuring yourself on the landing.
What's the key technique difference between a regular knee and a flying knee?
The flying knee uses the same knee technique as a regular knee strike, but you're performing it while airborne. Switch your legs mid-air, point your foot, and extend your hip as much as possible while keeping your chin down.
How does the Khao Loi work?
The classic Muay Thai flying knee strike where the fighter leaps off one or both feet and drives the knee upward into the opponent's head or body at the peak of the jump.
Where does the Khao Loi come from?
Khao Loi (เข่าลอย), literally 'floating knee' in Thai, is the traditional Muay Thai name for the flying knee strike. Kraitus and Rennehan document Khao Loi as one of the most revered techniques in the Muay Thai tradition, considered a 'fight-ending' weapon that demonstrates both courage and technical mastery.
Is the Khao Loi legal in competition?
Unified MMA: restricted — Knees to standing opponent legal, knees to head of grounded opponent banned; WBC/Boxing: banned — All knee strikes prohibited; WKF: banned — Prohibited in sport karate; Kyokushin: legal — Legal to body; WT: banned — Prohibited; ITF: banned — Prohibited; WAKO: banned — Prohibited in most formats; K: restricted — 1/GLORY — One clinch knee allowed before referee break; IFMA: legal — Legal — knees are a core Muay Thai weapon, clinch knees highly scored
How dangerous is the Khao Loi?
Danger rating 8/10. Very High — airborne knee strike; devastating KO potential (numerous UFC finishes)
How do I set up the Khao Loi?
The standard setup chain: Assume Fighting Stance → Generate Power → Execute Strike → Recover to Guard.
How do I defend against the Khao Loi?
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 Khao Loi?
Common variants: Straight knee (driving the knee straight upward into the body or head); Curved knee (round knee) (swinging the knee from the side in a circular path); Flying knee (leaping forward and driving the knee at the apex of the jump); Clinch knee (pulling the opponent into the knee from Muay Thai plum po…).
How effective is the Khao Loi in competition?
The flying knee has produced iconic finishes in Muay Thai and MMA.
What are common mistakes when doing the Khao Loi?
Top errors to watch for: Leaping without committing — a half-jump produces a weak, floating knee / Not pulling the opponent's head into the knee when gripping is possible — the collision doubles the force / Jumping straight up instead of forward — horizontal momentum is the key to the khao loi's power / Landing flat-footed after the leap, jarring the body and preventing follow-up.
What are other names for the Khao Loi?
The Khao Loi is also known as Kao Roi, Flying Knee, Jumping Knee Strike, Hiza Geri Tobi.