Bodybuilding is a form of body modification
Body modification
Body modification is the deliberate altering of the human body for any non-medical reason, such as aesthetics, sexual enhancement, a rite of passage, religious reasons, to display group membership or affiliation, to create body art, shock value, or self expression...

 involving intensive muscle hypertrophy
Muscle hypertrophy
Muscle hypertrophy is an increase in the size of muscle cells. It differs from muscle hyperplasia, which is the formation of new muscle cells.-Hypertrophy stimuli:A range of stimuli can increase the volume of muscle cells...

. An individual who engages in this activity is referred to as a bodybuilder. In competitive and professional bodybuilding
Professional bodybuilding
Professional bodybuilding or pro bodybuilding is a term that is used in the sport of bodybuilding, and may refer to several different concepts.- Income :...

, bodybuilders display their physiques to a panel of judge
A judge is a person who presides over court proceedings, either alone or as part of a panel of judges. The powers, functions, method of appointment, discipline, and training of judges vary widely across different jurisdictions. The judge is supposed to conduct the trial impartially and in an open...

s, who assign points based on their appearance. Bodybuilders prepare for competition through a combination of fat
Adipose tissue
In histology, adipose tissue or body fat or fat depot or just fat is loose connective tissue composed of adipocytes. It is technically composed of roughly only 80% fat; fat in its solitary state exists in the liver and muscles. Adipose tissue is derived from lipoblasts...

 loss, oil
An oil is any substance that is liquid at ambient temperatures and does not mix with water but may mix with other oils and organic solvents. This general definition includes vegetable oils, volatile essential oils, petrochemical oils, and synthetic oils....

s, and tanning
Sun tanning
Sun tanning or simply tanning is the process whereby skin color is darkened or tanned. The process is most often a result of exposure to ultraviolet radiation from the sun or from artificial sources, such as a tanning bed, but can also be a result of windburn or reflected light...

 (or tanning lotions) which combined with lighting make the definition of the muscle group more distinct.
Some well-known bodybuilders include Charles Atlas
Charles Atlas
Charles Atlas, born Angelo Siciliano , was the developer of a bodybuilding method and its associated exercise program that was best known for a landmark advertising campaign featuring Atlas's name and likeness; it has been described as one of the longest-lasting and most memorable ad campaigns of all...

, Steve Reeves
Steve Reeves
Stephen L. Reeves was an American bodybuilder and actor. At the peak of his career, he was the highest-paid actor in Europe.-Childhood:...

, Reg Park
Reg Park
Roy "Reg" Park from Leeds in West Yorkshire, England, was a bodybuilder, businessman and film actor.-Biography:...

, Arnold Schwarzenegger
Arnold Schwarzenegger
Arnold Alois Schwarzenegger is an Austrian-American former professional bodybuilder, actor, businessman, investor, and politician. Schwarzenegger served as the 38th Governor of California from 2003 until 2011....

, and Lou Ferrigno
Lou Ferrigno
Louis Jude "Lou" Ferrigno is an American actor, fitness trainer/consultant, and retired professional bodybuilder. As a bodybuilder, Ferrigno won an IFBB Mr. America title and two consecutive IFBB Mr. Universe titles, and appeared in the bodybuilding documentary Pumping Iron...