Kids and Jiu-Jitsu Competition: What the Research Says, by Age

Is competing good for your child? The honest answer: for children there is very little research on competition itself, none on ages 3 to 4, and we found no 2026 study of children doing jiu-jitsu. What exists comes from other sports and martial arts, mostly with teenagers, and it points one way: how the adults around a child handle competition matters more than the medal.

What the studies found

What happens in a child's brain and body around a match?

We do not know yet. We found no 2026 study that measured children's hormones before or after a match, in jiu-jitsu or in any other sport.

Two older studies give a hint, not an answer. In one, at-risk youths had their hormones measured during a hard martial arts class: oxytocin, a social-bonding hormone, stayed raised after the cool-down, while cortisol, a stress hormone, did not react (it kept rising in youths from regular schools).^[15] In a six-month, non-randomised program, at-risk teenage boys gained in self-control, mental switching and thinking speed, and early oxytocin responses went with less aggression and cortisol responses with higher self-esteem.^[16]

Both studied training, not competition, and neither says every child reacts this way. The one thing a parent can see is sleep: students who did more martial arts reported better sleep, though the link was modest.^[11]

Ages 3 to 4 (Apprentice): is there any research on competing this young?

No. We found no study of competition for children this young, and the closest research, a large review of children's sport, starts at age 5.^[1] Anyone who tells you what competing does to a three-year-old is guessing.

Here is our coaching view, and it is a view, not a finding. At this age a class is about play, listening, waiting for a turn and being brave enough to try. Watch whether your child runs onto the mat or hides behind your leg: that tells you more than any result.

Ages 5 to 8 (Junior): what does the research say?

Nothing we found studies competition at these ages, and the closest studies start around age 8. A review of 189 studies of children aged 5 to 17 found higher self-esteem and life satisfaction, fewer anxiety and depression symptoms and better social skills with organised sport, but team sports did better than individual ones.^[1]

In boys aged 8 to 12, soccer and taekwondo players made fewer self-control errors than boys who played no sport, with the two sports looking alike on most tests.^[9] Children aged 8 to 10 who did wrestling or taekwondo were also more flexible.^[10] A review of long-term martial arts studies, some starting around grade 2, found no consistent effect on aggression, up or down.^[6]

What to watch for: does your child still smile on the way home? None of this is about jiu-jitsu or a first tournament, so treat it as a guide, not a promise.

Ages 9 to 13 (Teens): what do the studies say about nerves, confidence and pressure?

This is where most of the evidence sits, and it says the adults' attitude matters. When both parents and coaches stressed effort, learning and improvement, young athletes (average age 12.5) enjoyed their sport more and felt less stress; when both stressed winning and comparison, they enjoyed it less and felt more stress.^[2] It was a one-time survey, so it shows a link, not a cause.

Among young tennis players (average age 13), those who felt higher expectations from their parents reported more nerves before competing, partly because they felt less capable.^[3] The effect was small and tennis is not a combat sport, but the message is clear: pressure from home is not free.

In a Polish survey, children aged 10 to 15 who trained judo reported less school stress and felt safer at school than children who did no sport.^[7] In Turkish athletes aged 12 to 18, competence rose with competitive level, but higher-level athletes rated their own character lower and girls reported less confidence than boys, so the picture is mixed.^[12]

Six weeks of supervised, non-competitive wrestling improved well-being and resilience and lowered sport anxiety in 30 inactive boys aged 12 to 15, compared with boys who did no program.^[8] There were no girls and no follow-up, so we cannot say the gains last.

Ages 14 to 17: what about teens in the adult class?

Teens this age train in our Adults 14+ class but compete in teen divisions, and the research on them is thin. The only 2026 competition trial we found was small: 14 teenage ju-jutsu competitors (ages 14 to 18) who practised confident posture and body language for 12 weeks reported less worry before competing, less stress and fewer lost matches than teens who trained as usual.^[13]

Read it with care. Ju-jutsu is not Brazilian jiu-jitsu, only two of the 14 were girls, and wins and points per match did not differ after adjustment. In karate competitors aged 16 to 25, more nerves in the week before went with more tension and tiredness and with worse sleep, but nobody tested whether better sleep lowers the nerves.^[14]

Does competing make a child a better person?

Studies found that sport can help children in ways parents care about, but nothing shows that competing itself makes a child kinder or better. Organised sport is linked to better social skills, helping behaviour and a sense of belonging, and some experiments point to better emotion control and resilience.^[1]

Against that, the higher-level teen athletes rated their own character lower,^[12] and martial arts had no uniform effect on aggression: results depended on the style, how classes were taught and the setting.^[6] So we say it carefully. A good club with good coaching gives a child a place to practise respect and self-control. The medal is not what does it.

What does competition not do, and what are the risks?

Competition is not free of risk and it is not right for every child. In a survey of 525 Chinese teenage boys in combat sports, 57% cut weight on purpose to compete, 78% named their coach as their main guide and 71% did it to face lighter opponents. Among those who cut, 18% showed eating-disorder symptoms on a screening questionnaire.^[4] That was not jiu-jitsu and not Canada, and it shows a link, not a cause.

In Japanese school clubs, judo had the second-highest concussion rate after rugby, and concussions were somewhat more common in competition (49% of cases) than in training (44%).^[5] Judo throws differ from kids' jiu-jitsu rules, and we found no 2026 injury rate for children's jiu-jitsu. Ask any club how it matches children by age and size, how it handles weight, and what it does after a knock to the head.

A competition also does not fix shyness or behaviour by itself, and a child who dreads it should not be pushed. In our view, training without competing is a perfectly good path.

Read next

• What competing does to the brain, mind, body and character: the research for all ages
• Competing as an adult: what the research says for men and women
• Martial arts and kids' confidence: what 12 studies show: focus, confidence, fitness and bullying
• Competition guide for families: kids and adults, step by step
• Kids' jiu-jitsu competition guide: what to expect and how to prepare
• Upcoming competitions near Laval, updated every morning

When are classes?

Every group also trains on Saturday morning, and teens aged 14 to 17 train in the Adults 14+ class (Mon to Thu 7:15 PM, Sat 10:45 AM). Classes are taught in French and English. We can lend your child a gi for the first 2 weeks, so you can try a few classes before buying one. First time? Here is what to expect at a first kids class, and how to tell if your child is ready.

Ready to join? Register online in a few minutes.

References

We looked for the newest studies first and kept the results that do not go our way. The last two are older background studies, from 2020 and 2021. Each link opens the study's official page in its journal.

1. Wade L, Eime R, Pankowiak A, Vella S, Robinson K, Kennedy S, Parkes R, Eather N (2026). The impact of sports participation on psychological health and social outcomes in children and adolescents: a systematic review and update to the "Mental Health through Sport" conceptual model. Systematic Reviews 15(1). https://doi.org/10.1186/s13643-026-03104-1
2. Fuller SLK, Moore EWG, Habeeb CM, Raedeke TD (2026). Conjointly-created parent and coach motivational climate profiles: adolescent athletes' goal orientations, enjoyment, and stress. Psychology of Sport and Exercise 86. https://doi.org/10.1016/j.psychsport.2026.103216
3. Zhang Z, Chen Z, Peng L (2026). The mediating role of basic psychological needs satisfaction in the link between parental expectations and competitive state anxiety among adolescent tennis players. Frontiers in Psychology 17. https://doi.org/10.3389/fpsyg.2026.1757414
4. Meng F, Zhang Z, Xu K, Lvu M, Zhong Y (2026). Weight loss practices, perceptions, and eating disorder symptoms among Chinese male adolescent combat sports athletes. Frontiers in Nutrition 12. https://doi.org/10.3389/fnut.2025.1726260
5. Fukushima K, Nakayama H, Tomori A, et al. (2026). Epidemiology of sport-related concussions among middle- and high-school students in Japan: a nationwide analysis using insurance registry data. BMJ Open Sport and Exercise Medicine 12(1). https://doi.org/10.1136/bmjsem-2025-002943
6. Deng L, Ma X, Luo Q (2026). Martial arts training and aggressive behavior in children and adolescents: a systematic review of longitudinal evidence and psychological processes. Frontiers in Public Health 14. https://doi.org/10.3389/fpubh.2026.1838396
7. Szczepanik K, Kurowski P, Siekańska M (2026). Comparison of stress sources and coping strategies in children practicing judo and their non-training peers. BMC Sports Science, Medicine and Rehabilitation 18(1). https://doi.org/10.1186/s13102-026-01802-w
8. Özkan R, Yılmaz C, Uzun RN, et al. (2026). Effects of wrestling training on psychological well-being, anxiety, and resilience in adolescent boys. BMC Psychology 14(1). https://doi.org/10.1186/s40359-026-03962-3
9. Kaddouri H, Zerouali S, Bouayad M, et al. (2026). Structured sport and executive functions in Moroccan children: a seven-indicator analysis comparing soccer, taekwondo, and non-athletes. Child Neuropsychology. https://doi.org/10.1080/09297049.2026.2703820
10. Gerodimos V, Tsiakaras N, Karatrantou K (2026). Flexibility in wrestlers, taekwondoists, and non-athletes during the developmental ages: the effects of sport, age, and sex. Journal of Functional Morphology and Kinesiology 11(1). https://doi.org/10.3390/jfmk11010057
11. Yang M, Ge X, Zhang D (2026). Is martial arts participation associated with sleep quality among Chinese adolescents? A cross-sectional baseline survey. Frontiers in Medicine 13. https://doi.org/10.3389/fmed.2026.1898748
12. Müjdeci I, Kılıç K, Bulut A, Kuru H (2026). Coaching effectiveness in competitive youth contact sports and martial arts: athletes' and coaches' perceptions. Frontiers in Psychology 16. https://doi.org/10.3389/fpsyg.2025.1725858
13. Niering M, Bachmann J, Beurskens R, Hansen F, Rudzki J, Seifert J (2026). Effects of body language training on mental health and performance in adolescent Ju Jutsu athletes. Frontiers in Sports and Active Living 8. https://doi.org/10.3389/fspor.2026.1868022
14. Belgacem A, Salem A, Yildiz M, et al. (2026). Impact of competitive anxiety on mood, sleep, and physical activity levels in young Tunisian karate athletes: a multidimensional prospective observational study. Medicine (Baltimore) 105(18). https://doi.org/10.1097/MD.0000000000048435
15. Harwood-Gross A, Feldman R, Zagoory-Sharon O, Rassovsky Y (2020). Hormonal reactivity during martial arts practice among high-risk youths. Psychoneuroendocrinology 121. https://doi.org/10.1016/j.psyneuen.2020.104806
16. Harwood-Gross A, Lambez B, Feldman R, Zagoory-Sharon O, Rassovsky Y (2021). The effect of martial arts training on cognitive and psychological functions in at-risk youths. Frontiers in Pediatrics 9. https://doi.org/10.3389/fped.2021.707047