Abstract
This study examined the effectiveness of tactical training and its coaching in soccer as a case study. In soccer, players are required to employ precise technique while making accurate judgments in changeable situations within the limitations of time and space, particularly in the interplay between defense and offense. Despite the significance of these abilities, limited research has been conducted in this area. We implemented defense training based on a team concept for three months. Our hypothesis posited that team performance could be improved when each member understands and accomplishes shared team tactics. The defense training in this study utilized mutually built keywords to enhance a common understanding within the team and checked levels of understanding to confirm individual comprehension. Subsequently, the effectiveness was examined through game analysis and comprehension test results. The game analysis suggested the effectiveness of defense tactics as part of the team concept. Furthermore, the timing of increased points won in games coincided with the timing of comprehension test confirmation, indicating that the improvement in the team’s understanding of defense stemmed from a deepened grasp of individual team tactics and improved situational judgment.
