Though exercise behaviors are typically viewed as health-promoting, certain forms of exercise (i.e., excessive exercise, unhealthy muscle-building behaviors) are considered maladaptive and are associated with negative physical and psychological outcomes. Psychosocial factors may put people at greater risk for engaging in maladaptive exercise. Based on deviance regulation theory, weight bias was examined as a potential moderator of the association between exercise identity and both excessive exercise and muscle-building behaviors.