A gym freak is a person who spends an excessive amount of time working out and focusing on their physical appearance, often to the exclusion of other areas of their life. They are highly dedicated to building muscle mass and improving their overall fitness through regular exercise at the gym. The term can be used both positively or negatively depending on the context in which it is used - some may see this dedication as admirable, while others might view it as an unhealthy obsession with physical appearance.