What is your favorite sport and why?

I am rugby.
Rugby is a forerunner of American football ("grid" by rugby fans)
to be a contact sport.
However, it's also like football, in that the action does not stop.
There is no time out, the teams are penalized if they hold the ball too long without running or hitting.
There are no offensive / defensive teams, each player is on the ground at all times, until he is replaced.