I am slowly back to exercising. My story is complicated and unique (like each one here) so I will jump to the question:

Any interesting sports with very low risk of concussion or head bumps?
I used to enjoy tennis a lot. Not sure it is safe, I remember accidentally once hitting myself with my racket, and worried about whether a tennis ball hits my head (again likelihood is low and I usually play with girls - so their strikes are not that strong).

I am looking for some type of competitive sport that helps me socialize even if it is with just one other person.

Any thoughts? (other than chess )