I think the only sport I watch is football, which is soccer to you Americans. I really enjoy it, it brings everyone together and I like the camaraderie on match day.
I think I'm one of the few Americans that actually calls it football and rejects the term soccer, and I absolutely hate American football.
But yeah, it's my favorite thing to watch and possibly the only reason why I have cable TV. And it really does bring everyone together! We, meaning my friends, family and relatives, all gather up during the World Cup to root on our favorite teams. Even friends and family that we aren't close to come and celebrate the games with us. It's pretty awesome.

I would play it, but I don't have the best coordination for that sport.
I also adore basketball, I watch Lakers every now and then, but not as much as I used to. And I used to play it competitively too, but I stopped doing that and only play it casually every now and then. I also used to play tennis, but stopped because I lost interest in it. Still follow my favorite athletes though.