Types of sports

Everybody knows there's a great variety of sports today. Some of us enjoy watching football on TV (whether it is European football, or American football which are completely different things), some of us like playing basketball with friends, others like playing chess which or checkmates which are also sports. All people are different, and due to their difference they chose and like different things. That's why the term "sport" doesn't mean exclusively "football", or "rugby" or "tennis". With the development of the modern civilization various games emerged, various activities were developed or revived from ancient times (like discus throwing and some others). It's even hard to count the number of activities that are recognized as sports today. Nevertheless, there are certain kinds of them that have become exceptionally popular among people. There are various ways of classifying them as well. For example there are classifications according to the number of people taking part in them (single, group games), time of year when they are mostly practiced (winter sports, summer sports), types of activities in them (like throwing discus, javelin, hammer, shot put etc.) their cyclic character (the ones with cyclic repetition of actions over and over again like cycle race, speed skating, biathlon and others), type of interaction of people in them (like martial arts), types of objects used in them (bodybuilding, weight lifting), their level of danger (extreme sports like rock climbing) and many others.