The Freikörperkultur (FKK) is a social and health culture that originated in the German Empire; its beginnings were historically part of the Lebensreform social movement in the late 19th century. The Freikörperkultur, which translates to free body culture, consists in the connection of health aspects of being naked in light, air and sun with intentions to reform life and society. It is partially identical with the culture of nudity, naturism and nudism in the sense of communal nudity of people and families in leisure time, sport and everyday life.

By the 20th century the culture of communal open air nudity in the "great outdoors" and its benefits to public health blossomed in Germany as an alternative to the stresses and anxieties of industrialised, urban life. Today, there are only few legal restrictions on public nudity in Germany. Under the terms "naturism" and "nudism", it is now internationally widespread, with associations and designated public recreational environments in numerous countries in Europe, North and South America, Australia, Africa, Asia and the Caribbean; the largest distribution is still found in German-speaking countries and Scandinavia.