I'm into motorsports, regularly watching F1, MotoGP, Moto2, Moto3, and SBK and catching up with what happens in some other major series (especially IndyCar which I rarely watch live due to the time zone differences). Also I follow cycling, though only major races like the Grand Tours, most Classics, the World Championship and sporadic other WT races.
I watch other sports mostly when there's something big going on like the Olympics or European/World Championships of swimming, and sometimes soccer when there's the World Cup or European Cup (though to be fair I've followed the latest two mostly because there's a channel here which airs a comedian group's comment of the matches, so that in the end I end up following them more for the sillyness of the comedians rather than the matches themselves).