Biathlon is a term used to describe any sporting event made up of two disciplines.
However, biathlon usually refers specifically to the winter sport that combines cross-country skiing and rifle shooting.
Other popular variants include summer biathlon, which combines cross-country running with riflery, modern biathlon and biathle, which combine running with swimming.
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A competitive biathlon is generally comprised of cross-country skiing and rifle shooting. There are other such events, such as a summer biathlon, which consist of cross-country running and riflery, and the modern biathlon, which combine running and swimming - but the first is the one most regularly used.