<p>During training, it is common to perform certain movements repeatedly within a short period—such as squats, jumping jacks, and burpees—where the frequency and rhythm of the exercises significantly impact their effectiveness. In this study, we focused on group training sessions involving repetitive exercises—a frequent scenario in gyms, home workouts, and remote training environments. Specifically, we investigated the potential of using music tempo to enhance group training effectiveness, diverging from traditional methods that primarily rely on visual cues for guidance and synchronization. We conducted a user study in an in-person group exercise setting with 18 participants organized into six groups of three. They performed squats under conditions with and without music aligned to their average tempo. We then examined how adding group-synchronized musical feedback—on top of natural interactions such as observing each other’s movements and listening to footsteps—affected training outcomes. By analyzing skeletal data and questionnaire responses, we found that music tempo contributed to improvements in both movement synchronization and aspects of the overall training experience. We also gathered suggestions for future enhancements in music-based support, including applying the proposed method to groups with smaller physical ability differences and considering differences in users’ musical backgrounds.</p>