Bodybuilding is the use of progressive resistance exercise to control and develop one’s musculature. An individual who engages in this activity is referred to as a bodybuilder. In professional bodybuilding, bodybuilders appear in lineups and perform specified poses (and later individual posing routines) for a panel of judges who rank the competitors based on criteria such as symmetry, muscularity, and conditioning. Bodybuilders prepare for competitions through a combination of intentional dehydration, elimination of nonessential body fat, and carbohydrate loading to achieve maximum vascularity, as well as tanning to accentuate muscular definition. Bodybuilders may use anabolic steroids to build muscles.