Sun tanning in the context of "Skin tone"

Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among individuals is caused by variation in pigmentation, which is largely the result of genetics (inherited from one's biological parents), and in adults in particular, due to exposure to the sun, disorders, or some combination thereof. Differences across populations evolved through natural selection and sexual selection, because of social norms and differences in environment, as well as regulation of the biochemical effects of ultraviolet radiation penetrating the skin.

Human skin color is influenced greatly by the amount of the pigment melanin present. Melanin is produced within the skin in cells called melanocytes; it is the main determinant of the skin color of darker-skin humans. The skin color of people with light skin is determined mainly by the bluish-white connective tissue under the dermis and by the hemoglobin circulating in the veins of the dermis. The red color underlying the skin becomes more visible, especially in the face, when, as a consequence of physical exercise, sexual arousal, or the stimulation of the nervous system (e.g. due to anger or embarrassment), arterioles dilate. Color is not entirely uniform across an individual's skin; for example, the skin of the palm and the soles of the feet is lighter than most other skin; this is more noticeable in darker-skinned people.

Naturism is a lifestyle of practicing non-sexual social nudity in private and in public; the word also refers to the cultural movement which advocates and defends that lifestyle. Both may alternatively be called nudism. Though the two terms are broadly interchangeable, nudism emphasizes the practice of nudity, whilst naturism highlights an attitude favoring harmony with nature and respect for the environment, into which that practice is integrated. That said, naturists come from a range of philosophical and cultural backgrounds; there is no single naturist ideology.

Ethical or philosophical nudism has a long history, with many advocates of the benefits of enjoying nature without clothing. At the turn of the 20th century, organizations emerged to promote social nudity and to establish private campgrounds and resorts for that purpose. Since the 1960s, with the acceptance of public places for clothing-optional recreation, individuals who do not identify themselves as naturists or nudists have been able to casually participate in nude activities. Nude recreation opportunities vary widely around the world, from isolated places known mainly to locals through officially designated nude beaches and parks, and on to public spaces and buildings in some jurisdictions.

Bodybuilding is the practice of progressive resistance exercise to build, control, and develop one's muscles via hypertrophy. An individual who engages in this activity is referred to as a bodybuilder. It is primarily undertaken for aesthetic purposes over functional ones, distinguishing it from similar activities such as powerlifting and calisthenics.

In competitive bodybuilding, competitors appear onstage in line-ups and perform specified poses (and later individual posing routines) for a panel of judges who rank them based on conditioning, muscularity, posing, size, stage presentation, and symmetry. Bodybuilders prepare for competitions by exercising and eliminating non-essential body fat. This is enhanced at the final stage by a combination of carbohydrate loading and dehydration to achieve maximum muscle definition and vascularity. Most bodybuilders also tan and shave their bodies prior to competition.

Olive skin is a human skin tone. It is often associated with pigmentation in the Type III, IV, and V ranges of the Fitzpatrick scale. It generally refers to moderate or lighter tan or brownish skin, and it is often described as having tan, brown, cream, greenish, yellowish, or golden undertones.

People with olive skin can sometimes become paler if their sun exposure is limited. However, lighter olive skin still tans more easily than light skin does, and generally still retains notable yellow or greenish undertones.