Freikörperkultur

thumb|right|"FKK" designated area signage on a beach in Brač, Croatia (FKK), meaning 'free body culture', is a social and health culture that originated in the German Empire, with its beginnings historically rooted in the social movement of the late 19th century. It promotes the health benefits of nudity—such as exposure to light, air, and sun—alongside a broader aim to reform life and society. shares cultural and philosophical ties with naturism and nudism, which involve communal nudity among individuals and families during leisure time, sports, and everyday life.

By the 20th century, recognised for its public health benefits, the practice of communal open-air nudity became increasingly visible in the German cultural sphere, shaped by growing interest in nature, hygiene, and overall wellbeing. This cultural emergence was partly a response to the lifestyle pressures of industrialised urban society, with advocates viewing nudity in natural environments as a restorative contrast to the alienation of modern city life. Public health reformers and Lebensreform adherents championed regular exposure to light, air, and sun—not merely as medical advice, but as a philosophical gesture toward vitality, simplicity, mental relaxation, and social renewal. Today, there are only a few legal restrictions on public nudity in Germany. Under the terms 'naturism' and 'nudism', it is now internationally widespread, with associations and designated public spaces in numerous countries in Europe, North and South America, Australia, Africa, Asia, and the Caribbean. The greatest concentration remains in Central Europe and Scandinavia.