This study aims to examine the role of sport sociology in the practice of coaching and leadership of soccer coaches, especially in the context of multicultural teams. Through a qualitative approach and in-depth interviews with a number of soccer coaches, it was found that understanding the social background, culture, and individual values ??of players is very important in creating effective interpersonal relationships in the team. The results showed that coaches who have intercultural communication skills and adaptive leadership styles tend to be successful in building strong social cohesion and solidarity among players. Social integration in a soccer team is a dynamic process, where the coach acts as a socialization agent who is able to balance diversity without causing internal conflict. These findings contribute to the development of more inclusive and socially value-oriented coaching strategies. This study also emphasizes the importance of coaching training that includes social and cultural aspects in the management of modern sports teams.

This study aims to analyze the effect of speed training methods on 100-meter running ability in adolescents aged 16-17 years in Serang City. The background of this study is the importance of speed training in improving running performance, especially in adolescents who are growing. The purpose of this study was to determine the significant effect of various speed training methods on 100-meter running time. This study used a quasi-experimental design with a control group, which involved measurements before and after training. The study sample consisted of 100 adolescents (50 people in the experimental group and 50 people in the control group). The experimental group followed a speed training program that was arranged for eight weeks, while the control group continued their usual physical activities. The results showed a significant increase.