Any form of competition can be argued to be considered "sport". Some are organized, some require physical skill, some require mental skill, some utilize props, some use technology, some are individualized, some are team based, some involve physical contact, some make you wealthy, some will drive you broke, some are considered dangerous, some are believed to be completely safe, some pit the individual against nature, etc. etc.
The point is there's no right answer and thus it becomes a matter of individual opinion. And, in a forum like this it will most likely lead to silly arguments.
That being said, in my opinion, all "sports" fall short when compared to:

