Maybe, but I was also trying to address the finding that I quoted in my response, that individual sport athletes fare worse in mental health than students who don't do any sports at all. There must be a reason that individual exercise supports mental health but individual sports evidently do not, which is why I think competition/pressure must be a factor. And again, in American schools individual sports are done with teams. I agree that they're less mutually dependent than team sports, but they still foster team bonding, mutual accountability and working towards shared goals. But yeah I'm not especially surprised that team > individual, more that no sports > individual.