This might help with understanding. Both of my children dislike team sports. When I asked why, DS8 told me, "it was because of the pressure of not letting the team down" if he made a mistake. They are both protectionist and are harder on themselves than the team would be.
We have found they both like skiing, skateboarding, rock climbing, and hiking, basically anything that doesn't involve a team or other kids counting on them.
Good luck! If you find a solution, I would love to hear it.
Thanks for responding. DS is very active with swimming (just not on a team), running, etc. I'm not so worried about him getting physical activity. Also, I think eventually he might like to get involved in a more individual sport. I really like the rock climbing idea. Of course in FL we have to go to the place that has the rock climbing walls!
Hopefully someone can give some advice on how to handle the PE thing at school.