Previous research has shown gender differences in the motivations to be physically active, in mobile phone gratifications, and social media usage, but so far these areas have not been studied together. Based on the uses and gratification approach and self-determination theory, we aimed to identify gender-specific gratifications and determinants of fitness app usage in combination with fitness-related Facebook groups. Results of an online survey (N = 171) and of a mobile experience sampling method (N = 31) revealed that the app Runtastic was primarily used for achieving goals and to improve enjoyment for physical activity, with men and older participants sharing results with others in Facebook groups more often than women and younger participants. Conclusions regarding genderspecific targeting strategies and user-centered design and content of mHealth features are presented
