#Fittok: How Fitfluencers' Videos on Tiktok Impact Adolescents' Body Satisfaction, Workout Intention, and Behavior

ABSTRACT Fitfluencers often flaunt their ideal bodies on TikTok. Additionally, they frequently demonstrate workouts and give authentic insights into their lives. Through three experiments, we examine how these videos impact adolescents' (14–18 years) body satisfaction and workout intention and behavior. Study 1 ( N = 221) shows no significant difference between fitfluencers' posing and workout TikTok videos on body satisfaction and workout intention. The Solomon four‐group design of Study 2 ( N = 176) shows that fitfluencers' posing TikTok videos (vs. lifehack videos) induce more appearance comparison and more contrastive comparison feelings, which lead to less body satisfaction. Effects on workout intention were not significant. Study 3 ( N = 154) similarly shows that fitfluencers' videos (posing and authenticity vs. lifehack), induce more appearance comparison and more contrastive comparison feelings, which lead to less body satisfaction, as in Study 2. They also induce more assimilative comparison feelings, which lead to a greater workout intention. Exercise behavior did not differ across all three video types. As in Study 1, no significant differences between fitfluencers' videos (posing and authenticity) were found. This study contributes to social comparison theory and fitfluencer literature by showing that assimilative and contrastive comparison feelings drive different dependent variables.