Great question, @Natalija. I did some online digging and came across a meta-analysis "Reducing aggression with martial arts: A meta-analysis of child and youth studies" - DOI:10.1016/j.avb.2017.03.001 that demonstrates that martial arts reduce externalising behaviour.
The study found support for the relationship between martial arts and reduced aggression amongst a range of youth populations.
Great question, @Natalija. I did some online digging and came across a meta-analysis "Reducing aggression with martial arts: A meta-analysis of child and youth studies" - DOI:10.1016/j.avb.2017.03.001 that demonstrates that martial arts reduce externalising behaviour.
The study found support for the relationship between martial arts and reduced aggression amongst a range of youth populations.