Last updated: July 8, 2026
Quick Definition
Stomps to a grounded opponent are a foul under the Unified Rules of MMA. The rule bans any downward strike with the bottom of the foot or heel against a fighter who has any part of their body other than the hands or feet touching the canvas.
What is the stomps to a grounded opponent rule?
Stomps to a grounded opponent are banned under the Unified Rules of Mixed Martial Arts, the ruleset used by the UFC and adopted by athletic commissions across North America. The official foul list words it as stomping a grounded opponent, and it sits alongside a closely related foul, kneeing or kicking the head of a grounded opponent. The two are often mixed up.
The Association of Boxing Commissions and Combative Sports (ABC), which maintains the Unified Rules, defines a stomp as a strike where a fighter lifts a bent leg and drives the bottom of the foot or the heel downward into the opponent. Once an opponent is grounded, stomps to any part of their body are illegal. That includes the feet and the hands.
A stomp lets a standing fighter drop full body weight onto someone who may be unable to defend, which raises the risk of fractures and brain injury. The ban dates to the regulatory push of the early 2000s, when the New Jersey State Athletic Control Board codified the framework that the ABC adopted as the Unified Rules on July 30, 2009.
Punches and elbows to a grounded opponent remain legal under the same ruleset, including to the head. That is why ground and pound, the practice of striking a downed opponent from top position, exists while stomps do not.
Who counts as a grounded opponent?
The answer changed on November 1, 2024. Under the current Unified Rules, a fighter is grounded when any part of their body other than the hands or feet touches the canvas. A knee, a forearm, a backside, or a shin all qualify. A single palm pressed to the mat no longer does.
Earlier versions drew the line differently, and the shifts matter because clips from older fights follow older definitions.
| Period | Definition of grounded |
|---|---|
| 2009 rules | Anything beyond the soles of the feet touching the mat, even one finger |
| 2016-2024 revisions | One flat palm down, or any other body part touching the mat (a knee or arm counted, fingers did not) |
| Since November 1, 2024 | Any body part other than the hands or feet touching the mat |
The palm-down wording created a loophole. Fighters learned to touch a palm to the canvas at the right moment, which made them grounded and turned an incoming knee or kick to the head into a foul. The ABC voted on July 23, 2024, to close it, per CBS Sports, and the updated definition debuted at UFC Edmonton on November 2, 2024.
What is legal and what is illegal
The rule reads as absolute, and for stomps it is. The wider picture of leg strikes against a grounded fighter has more moving parts, which is where fans get tripped up watching fights.
| Strike | Target | Legal? |
|---|---|---|
| Stomp | Any part of a grounded opponent | No |
| Foot stomp | Feet of a standing opponent (in the clinch) | Yes |
| Axe kick | Body of a grounded opponent | Yes |
| Kick or knee | Body or legs of a grounded opponent | Yes |
| Kick or knee | Head of a grounded opponent | No |
| Punch or elbow | Head or body of a grounded opponent | Yes |
The axe kick line surprises people. The ABC’s rule text states plainly that axe kicks are not stomps: an axe kick travels down with a straight leg and lands with the heel in an arc, while a stomp stamps down from a bent knee. An axe kick to a grounded opponent’s head is still a foul, since it falls under kicking the head of a grounded fighter.
Foot stomps in the clinch are the other frequent point of confusion. Stamping on a standing opponent’s foot is explicitly legal, and fighters use it to off-balance an opponent pressed against the fence and open up other attacks.
Penalties for a stomp to a grounded opponent
Referees decide the punishment. Under the Unified Rules, a foul can draw a warning or a point deduction depending on severity and intent, and a flagrant or repeated foul can end in disqualification. Only the referee can assess a foul.
The ABC’s foul procedures spell out the harder cases. An intentional foul that ends the bout through injury means disqualification. If the bout continues after an intentional foul causes injury, the referee must deduct two points from the offending fighter, and the fouled fighter can receive up to five minutes to recover before the action restarts.
Stomps in other MMA promotions
Japan took a different path. PRIDE Fighting Championships permitted head stomps and soccer kicks against downed opponents throughout its run. Knees to a downed opponent’s head were legal there too, while elbows to the head were banned instead. RIZIN, run by former PRIDE executive Nobuyuki Sakakibara, keeps a similar ruleset today, with soccer kicks and knees to a grounded opponent’s head both legal.
ONE Championship allowed soccer kicks in its early years before banning them in 2016 as the promotion expanded globally, according to Wikipedia’s summary of MMA rulesets. Fighters who cross over from those rulesets to the UFC have to drop the techniques from their game entirely.
Frequently Asked Questions
Are foot stomps legal in the UFC?
Yes, against a standing opponent. Fighters stomp feet in the clinch regularly. The moment an opponent becomes grounded, stomps to any target become a foul.
Is an axe kick the same as a stomp?
No. The ABC’s rule text specifies that axe kicks are not stomps. An axe kick to the body of a grounded opponent is legal, though the head remains off-limits.
Did the 2024 rule changes make stomps legal?
No. Those updates legalized 12-6 elbows and rewrote the definition of a grounded fighter, and that was the extent of it. Stomping stayed on the foul list.
Can a fighter stomp a grounded opponent’s foot?
No. Once a fighter is grounded, the ABC’s rules prohibit stomps of any kind, even to the feet.
Sources
- Association of Boxing Commissions and Combative Sports. “Unified Rules of MMA.”
https://www.abcboxing.com/wp-content/uploads/2025/08/Unified-Rules-of-MMA-8.2025.pdf. Accessed July 9, 2026. - UFC. “Unified Rules of Mixed Martial Arts.”
https://www.ufc.com/unified-rules-mixed-martial-arts. Accessed July 9, 2026. - CBS Sports. “Commission removes 12-6 elbows from Unified MMA rules, updates grounded opponent rule.”
https://www.cbssports.com/mma/news/commission-removes-12-6-elbows-from-unified-mma-rules-updates-grounded-opponent-rule/. Accessed July 9, 2026. - Combat Sports Law. “MMA’s Two Brand New Rules.”
https://combatsportslaw.com/2024/07/24/mmas-two-brand-new-rules/. Accessed July 9, 2026. - Heavy.com. “Explaining the New MMA Rules That Debuted at UFC Edmonton.”
https://heavy.com/sports/ufc/mma-elbow-knee-rule-changes-explained/. Accessed July 9, 2026. - Wikipedia. “Mixed martial arts rules.”
https://en.wikipedia.org/wiki/Mixed_martial_arts_rules. Accessed July 9, 2026. - Wikipedia. “Soccer kick.”
https://en.wikipedia.org/wiki/Soccer_kick. Accessed July 9, 2026.
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