MMA: The Complete Guide for Fighters, Parents and Coaches

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A 6 a.m. class in a strip-mall gym: wraps going on in silence, a coach calling out drills, the smell of mat cleaner and coffee. A Saturday-night amateur card in a hotel ballroom, a folding-chair crowd, a kid from the neighborhood walking out to his first cage fight. A sold-out arena in Las Vegas, the lights dropping as the main event fighters touch gloves. Mixed martial arts (MMA) is all of these. It’s the youngest of the major combat sports: the first UFC event was held in Denver on November 12, 1993, and Nevada and New Jersey only began sanctioning MMA in 2001, after a series of rule changes.

This page is MMA for athletes and the people who look after them: how a fight works and is scored, what the sport looks like from kids’ grappling classes to pro title fights, and, most of all, how to stay healthy doing it. Sports health is the heart of it: the injuries fighters get most, concussion, the risks of cutting weight, skin infections from shared mats, and how to train and recover so you can keep showing up. It’s general information, not medical advice.

MMA at a glance

What it is	A full-contact sport that combines striking (punches, kicks, knees, elbows) with grappling (takedowns, ground control, chokes and joint locks). Most fighters come from wrestling, Brazilian jiu-jitsu (BJJ), boxing, Muay Thai or kickboxing.
Fight length	Professional rounds are 5 minutes with a 1-minute rest; a bout can’t go past five rounds or 25 minutes. Non-title fights are usually three rounds, title fights five. Amateur bouts are shorter.
How you win	Knockout, technical knockout (TKO), submission (a tap-out), or the judges’ decision under the 10-point must system. A fighter can also lose by disqualification.
Weight classes	The Unified Rules list 15, from atomweight (up to 105 lb) to super heavyweight (over 265 lb). Promotions use some of them.
Who runs it	In the US, state and tribal athletic commissions license fighters and oversee events, most using the Unified Rules of the Association of Boxing Commissions and Combative Sports (ABC). Worldwide amateur MMA: the International Mixed Martial Arts Federation (IMMAF).
Big promotions	UFC, PFL (which bought Bellator in 2023) and ONE Championship, plus many regional promotions.
Most common injuries	Cuts and bruises to the head and face, concussion, hand and wrist injuries, nose and eye injuries, and joint injuries from submissions; in training, problems from cutting weight and skin infections.

How MMA works

Two fighters of about the same weight meet in a cage or ring wearing small, open-finger gloves, shorts and a mouthpiece, barefoot. Under the Unified Rules of MMA, the version used by most US commissions, each professional round is five minutes with a one-minute break. Fighters can strike standing and on the ground, take each other down and look for a choke or joint lock. The referee is the only person who can stop the fight.

A fight ends early by knockout, by TKO (the referee, the ringside doctor or a corner stops it because a fighter can’t defend themselves or is too hurt to go on) or by submission, when a fighter taps out or says they’re done. If it goes the distance, three judges score each round with the 10-point must system: the winner of a round gets 10 and the loser 9 or less. Judges look first at effective striking and grappling, and only if that’s even do they look at effective aggressiveness and then control of the fighting area. A 10-8 round means a big win in damage, dominance and duration.

The rules ban a long list of fouls, including head butts, eye gouging, biting, hair pulling, groin strikes, strikes to the back of the head and spine, throat strikes, small-joint manipulation (fingers and toes), and kicks or knees to the head of a grounded opponent. A fighter counts as grounded when any part of the body other than the hands or feet touches the canvas. Our MMA rules page walks through all of it, weight classes included.

MMA at every level

Kids and teens: most young people who “do MMA” are really learning its base sports: wrestling, jiu-jitsu, boxing and Muay Thai or kickboxing. That’s a good thing. The American Academy of Pediatrics (AAP) says martial arts can give children vigorous exercise and better fitness, with qualified instructors, and that contact training should wait until a child has shown the physical and emotional maturity for it. But the AAP also says child and adolescent participation in MMA bouts with head strikes, slams and chokeholds should be strongly discouraged because of the risk of concussion, choking injuries and other head and neck injuries. Internationally, IMMAF’s youth rules (ages 10 to 17) don’t allow any strikes to the head or face. Read our youth MMA page before signing up.

Amateur MMA: the step between the gym and a pro career. IMMAF amateur rules use shorter bouts and more protection: 6 to 8 oz gloves, mandatory shin guards and rash guards, and bans on elbows, heel hooks and knees to the head. Amateur rules in the US vary by state, so check with your state athletic commission or the event’s sanctioning body.

Professional MMA: pros are licensed by the commission where they fight, and that comes with medical tests. Rhode Island’s rules, for example, ask for a physical exam, a dilated eye exam and an EKG within a year, a brain MRI or CT scan within three years, and blood tests for HIV and hepatitis B and C within six months, plus a doctor’s check before the fight. The biggest promotion, the UFC, has run since 1993 and is now part of TKO Group Holdings. The PFL bought Bellator in 2023, and ONE Championship is based in Asia. Our leagues and associations page covers who’s who.

Olympic and college: MMA isn’t an Olympic sport and there’s no NCAA or high school MMA. The paths run through its base sports: wrestling, boxing, judo and taekwondo are all on the Olympic program, and many pro fighters wrestled in high school and college. See our wrestling guide. IMMAF, founded in 2012, runs amateur world championships and has more than 120 national federations.

Adult recreational: most people who train MMA never fight. They take classes for fitness, self-defense and the fun of learning a skill, which is a very different risk from competing. You choose how hard you spar, or whether you spar at all.

Sports health for MMA fighters

MMA is a sport where the goal is to hurt or submit the other person, so it can’t be made risk-free. What you can control is how you train, how you make weight, how you protect your skin and your brain, and when you stop. This section is general information. If you’re hurt, see a sports medicine doctor, physical therapist or athletic trainer.

The most common MMA injuries

• Head and face: a 2014 meta-analysis of competition studies found the head was the most injured body region (66.8% to 78.0% of injuries), followed by the wrist and hand, and the most common injury types were cuts (lacerations) and fractures.
• Injury rates in fights: in pro events in Nevada from 2001 to 2004, there were 28.6 injuries per 100 fight participations; facial cuts made up 47.9% of injuries, followed by the hand (13.5%), nose (10.4%) and eye (8.3%). A 2025 review of studies after the Unified Rules were adopted found 23.6 to 54.5 injuries per 100 athlete-exposures and concussion rates of 14.7 to 16.1 per 100, with injury patterns similar to before.
• Joints: armbars, kimuras and leg locks load the elbow, shoulder and knee. Tap early and often in training; the AAP also points out that no protective gear can protect against the effects of a choke held too long.
• Cauliflower ear: rubbing and blows to the ear during grappling can cause bleeding under the skin that hardens if it isn’t drained. If an ear swells, see a doctor quickly.

Our MMA injuries page goes deeper into each one and how to lower the risk.

Concussion: recognize and remove

Head strikes are part of the sport, and so are hard falls and slams. Reviews put head trauma at well over half of all MMA competition injuries. The AAP adds an important point about gear: soft headgear may help with cuts and scrapes, but there’s no evidence it lowers the risk of concussion, and a false sense of safety can make people spar harder. The best protection is less hard sparring to the head. The CDC’s HEADS UP program lists the signs to watch for: a fighter who looks dazed or confused, or has a headache, dizziness, balance problems or sensitivity to light or noise.

• Remove the athlete from sparring or the fight right away.
• Keep them out for the rest of that day and until a healthcare provider clears them.
• Return slowly, step by step; commissions also hand out medical suspensions after fights.
• Call 911 for danger signs: a seizure, passing out, a headache that keeps getting worse, repeated vomiting, or one pupil larger than the other.

Weight cutting: the hidden risk

Most MMA fighters cut weight. In a survey of 314 professional and amateur fighters, 97.2% of men and all the women purposely lost weight for competition, and most used water loading and fluid restriction; more than half used sweat suits. In December 2015, after the death of a fighter linked to cutting weight, ONE Championship banned weight cutting by dehydration and began hydration testing in fight week. The International Society of Sports Nutrition (ISSN) 2025 position stand suggests staying within 12% to 15% of your division’s limit between fight camps, and notes that the long-term health effects of frequent weight cuts are still unknown.

The safe approach is the same as in wrestling: pick a weight class you can make without drastic dehydration, lose weight slowly over the camp, and plan it with a registered sports dietitian and a doctor, not with the loudest person in the locker room. A smart scale (see our smart scale guide) helps you watch the trend. Our MMA nutrition page covers what to eat.

Skin infections: keep them off the mat

Ringworm, impetigo, staph and herpes spread on shared mats through skin-to-skin contact. The National Athletic Trainers’ Association (NATA) position statement on skin diseases lists the habits that work: shower right after every session, don’t share towels, bar soap, water bottles or gear, wash training clothes and towels every day, wear shower shoes in the locker room, and clean mats on a set schedule with an EPA-registered disinfectant. Don’t train with an open sore or a new rash; show it to a doctor first.

When to see a professional

Don’t train through a concussion sign, a swollen ear, a hand that swells after punching, a knee or elbow that gives way, or a rash that’s spreading. A sports medicine physician handles most of these without surgery, a physical therapist rebuilds strength after an injury, and an athletic trainer or ringside physician handles first aid and return-to-play steps.

Training and conditioning for MMA

An MMA fight asks for almost everything: power for takedowns and strikes, grip and hip strength for grappling, and the engine to keep going. The ISSN notes that once a combat bout lasts more than four minutes, the aerobic system can supply more than 70% of the energy, with short all-out bursts on top. So build both: an aerobic base, then rounds and intervals that look like the fight.

Between camps: strength work for legs, hips, back, neck and grip; technique in every discipline; and light or no hard sparring. Fight camp: sharpen the game plan, add fight-pace rounds, and plan the weight descent early. Every week: keep hard sparring to the head limited and controlled, with partners you trust. Many fighters watch sleep and recovery with a wearable; see HRV for athletes and our MMA training page. For fight week and the night itself, see our fight day page.

Recovery between sessions and after fights

Shower first, then food, fluids and sleep: the CDC, citing the American Academy of Sleep Medicine, recommends 8 to 10 hours a night for teens and 7 or more for adults. Simple tools help many fighters feel better between hard days: a foam roller or massage gun for tight hips, back and shoulders, and soft recovery slides after a long day on the mats. They’re about comfort, not treatment. We’ve built a full recovery kit in MMA recovery gear, and grapplers will find more in jiu-jitsu recovery. Our MMA recovery page puts it all into a weekly plan.

Gear for MMA

• Fight gloves: pros wear small, open-finger gloves, usually 4 oz (rules commonly say at least 4 oz and generally no more than 6 oz). Amateurs under IMMAF rules wear 6 to 8 oz.
• Sparring gloves: bigger, more padded MMA or hybrid gloves (often 7 oz) protect your hands and your partner.
• Mouthguard: required in competition; the round can’t start without it.
• Hand wraps, shin guards, groin protection (required for men in pro fights), a rash guard and fight shorts.
• Hygiene kit: your own towel, soap and shower shoes.

Four staples for an MMA bag: the Hayabusa T3 4oz Pro Style MMA Gloves (about $100 on Amazon), the RDX 7oz hybrid MMA sparring gloves for training (about $33), a Shock Doctor Gel Max boil-and-bite mouthguard sold in youth and adult sizes, and a TriggerPoint GRID foam roller for after training. The full list is on our MMA gear page, and our best wearables for MMA page covers trackers.

For more after training, browse Recovery & Regeneration and Training & Performance.

MMA FAQs

How long is an MMA fight?

Professional rounds are 5 minutes with a 1-minute rest. Non-title fights are usually three rounds (15 minutes) and title fights five (25 minutes), the most the Unified Rules allow. Amateur and youth bouts are shorter: under IMMAF youth rules, for example, 16- and 17-year-olds fight three 2-minute rounds.

Is MMA safe for kids?

Learning its base sports with a qualified coach can be. The AAP says martial arts offer good exercise, but it strongly discourages children and teens from MMA bouts with head strikes, slams and chokes. Youth rules such as IMMAF’s ban all strikes to the head. Start with wrestling, jiu-jitsu or non-contact striking classes.

What weight classes are there in MMA?

The Unified Rules list 15, from atomweight (up to 105 lb) through strawweight, flyweight, bantamweight, featherweight, lightweight, welterweight, middleweight and light heavyweight (up to 205 lb), to heavyweight (up to 265 lb) and super heavyweight. Promotions choose which ones they use.

Does headgear prevent concussions in MMA sparring?

No evidence says it does. The AAP notes that padded headgear probably helps prevent cuts, scrapes and bruises, but not concussion. Many gyms still use it for sparring; the bigger safety step is limiting hard head contact in training.

Is cutting weight dangerous?

Rapid weight loss through dehydration carries real risks, and its long-term effects aren’t known. Pick a weight class you can make by eating well, keep your walking weight close to it, and plan any cut with a registered sports dietitian and a doctor.

MMA rewards courage, but the fighters who last are the ones who spar smart, tap early, make weight the slow way, keep their skin clean and tell someone when something’s wrong. Keep exploring: our recovery tools guide, electrolytes for hard training days, and every other sport on our sports hub.