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 competitive amateur and professional bodybuilding, bodybuilders appear in lineups doing specified poses, and later perform individual posing routines, for a panel of judges who rank competitors based on criteria such as symmetry, muscularity, and conditioning. Bodybuilders prepare for competition through a combination of dehydration, fat loss, oils, and tanning (or tanning lotions) which make their muscular definition more distinct. Some well-known bodybuilders include Charles Atlas, Steve Reeves, Reg Park, Arnold Schwarzenegger, and Lou Ferrigno. Currently, IFBB professional bodybuilder Phil Heath from the United States holds the title of Mr. Olympia. The winner of the annual Mr. Olympia contest is generally recognized as the world's top professional male bodybuilder.