What do you consider a sport?

I think that the word "sport" carries too much weight. People become really offended when you say that certain things are not sports. Just because seomthing does not have the title "sport", does not make it any less legitimate of an activity. It also does not mean that it is necessarily easy or that it does not require athleticism. It requires athleticism to throw a ball against a wall and catch it. This does not make this a sport. It is hard to learn astrophysics. You have to be in shape to travel in space. I feel that a sport is: an athletic physical activity performed as an individual or in teams, which implements an active offense and defense in opposition to each other, and concludes with having only a winner, loser, or a tie. What do you guys think? Once again, not offending anyone unless you interpret this in an offensive way. Just my opinion, and you're very entitled to your own.