The claim that playing in sports increases stress and social skills is true, depending on the sport. In the article, "The Mental Health Benefits of Extracurricular Sports for Kids" it talks about how sports that cause you to interact with other individuals have a vast amount of psychological, cognitive and physical benefits. One example of this being that playing sports and exercising increases serotonin and dopamine into the body, in relation to this a persons mood is more likely to improve. Another article I found that backs up this claim is, "Mental Health Benefits of Playing Sports", this shares a study that was placed on kids who did vs did not participate in group sports. This article states, "In addition, the study found a 20% lower rule-breaking-behavior score in team sport participants compared with children with no participation in sports. Playing team sports helped children become more confident, social, inquisitive, respectful, and engaged." One thing I will say is that individual sports have a very beneficial effect on children and people as well, but not always. The article, "Mental Health in Team Sports Compared to Individual Sports" says, "When an individual sport athlete loses, they feel they have failed themselves because they are the only one to blame for the loss. The sense of failure that they put on themselves can lead to feeling depressed and cause them to feel some anxiety when they go to compete the next time." Individual sports are different because you do not always have a teammate or other individual to pick you up when you're feeling down, much of the time individual sports can cause more anxiety and tension for the individual playing in said sport. However, as we talk about this, physical, cognitive and psychological benefits are still happening whether it is an individual sport or team sport. Individual sports can also have benefits that team sports may not have such as proving focus and concentration. Both have pros and cons to it and it is important for everyone to get their body moving and to stay as happy and healthy as possible!
https://www.trine.edu/academics/centers/center-for-sports-studies/blog/2021/mental_health_in_team_sports_compared_to_individual_sports.aspx
https://https://www.simoneskids.org/the-mental-health-benefits-of-extracurricular-sports-for-kids/?gad_source=1&gclid=Cj0KCQiAy8K8BhCZARIsAKJ8sfQcxsT4BWYJ3n5sA57QbTastAqWIqRqXniAmgO-1ZP3iODfX1K-MaAaAoL0EALw_wcB
https://www.saybrook.edu/unbound/mental-health-benefits-playing-sports/