Muscle dysmorphia is defined as a disorder related to:

Muscle dysmorphia is characterized by an intense and obsessive preoccupation with gaining muscle mass and an altered perception of one's body. Individuals with this disorder often feel that they are not muscular enough, leading to excessive exercise, dietary restrictions, and sometimes the use of anabolic steroids in an effort to achieve their desired physique. This extreme worry about gaining muscle can significantly impact a person's daily life, mental well-being, and social interactions, as they may constantly strive for an unattainable body image.

In contrast, the other options reflect different attitudes or issues related to health and fitness. A concern for overall health typically encompasses a balanced approach that prioritizes well-being rather than fixation on muscle size. A preference for endurance sports suggests an inclination towards activities that do not emphasize muscularity but rather cardiovascular fitness. An attitude of body acceptance promotes a positive self-view and contentment with one's current body image, which stands in stark contrast to the obsessive nature of muscle dysmorphia.