Exploring the Intention to Share Personal Exercise Information on Social Networking Sites via Sports Apps Using a Modification of the Theory of Reasoned Action

The global surge in health awareness and the widespread adoption of fitness applications (apps) on smartphones have reshaped how individuals approach health and leisure activities. This study employs a modified model of the Theory of Reasoned Action (TRA) by introducing three variables—credibility, reciprocity, and entertainment value—to examine the impact of fitness apps on users’ sharing attitudes, community identification, and sharing intentions. A two-part analytical process, involving a measurement model and structural equation modeling analysis, was used to assess the instrument and test the hypotheses, based on 408 valid questionnaires from fitness participants with over 1 year of experience. The findings showed that the three variables significantly influenced sharing attitudes and community identification, while sharing attitudes and subjective norms positively affected sharing intentions. These results provide a strategic reference for sports app developers in managing social networking features.