what is a sport and whats not

I personally would think it would be cool to analyze a sport that we've never played before to see how we see a sport from an "outsiders" point of view. I know that when we talk in class and people are talking about baseball and track and even rugby I can't relate or sometimes even feel the same way they do about a topic because I've never experienced some of the things they talk about. I think it's really hard to discuss how one "game" is more of a sport than another if it's never been tried. Something may seem easy but in reality it's REALLY not.
i.e. We're in our off season right now and all we do is condition and lift. We have this running "punishment" where you have to snake through the stair separating the bleachers there are 8 sets of stairs going up and all you have to do is run up one come down the next and so on then sprint to where you started and go again. It doesn't sound like it's that bad and we only do 4-6 but when you actually do them it is incredibly hard.