Archery, a sport requiring precise muscle coordination, traditionally relies on extensive practice for skill enhancement. Recent advancements use motion sensor, heart rate sensor, electromyographic sensor, and cameras to evaluate performance. This study introduces a real-time accuracy feedback system to improve motor-cognitive coordination and reduce the training time needed for beginners. Two groups— one with attention-based reminder devices and one without—were compared based on target score standard deviations algorithm scores for posture stability, and NASA-TLX scores for attention load in a pilot study. Future works concern improving the algorithm, device development, and designing feedback to encourage self-triggered releases. This study provides the groundwork for future experiments focused on enhancing archery training using the stability indicator device.