To determine the effectiveness of FIFA 11+ kids as an injury prevention program in male youth football players. In addition, this study will evaluate the implementation of FIFA 11+ as warming up and injury prevention for the youth football club. The quasi experimental and descriptive survey study design was conducted in this study. 24 football clubs in Semarang were observed and analyzed using interviews and questioner. From 24 football clubs, just 20 football clubs have kid's teams between the ages of 9 and 12 in January 2018-June 2020. The total youth athlete is 980 kids. The average time each warming up is 15-20 minutes. The rate of injury during a competition in each game base on how many athletes were injured was fifty. The coach age was sufficient for implementing the program-the coach's license was also an active variable for the success injury prevention program in their athletes.

This study investigated the influence of the intention to lean the body forward on spatiotemporal and ground reaction force variables during the acceleration phase of a sprint. Fourteen active adults performed two 50 m sprints (with and without the intention to lean), during which spatiotemporal variables and impulses were obtained using a long force platform system. Effect size (Cohen’s d) was used to examine the differences between the two trials. We found that running speed and net anteroposterior impulse did not change by the intention for all steps. However, step frequency increased in the initial two steps through decreases in support time and flight time by the intention. Moreover, these shorter support and flight times were caused by a decrease in the vertical impulse. The propulsive impulse did not change during the initial part of acceleration phase, but the braking impulse decreased at the first step. This study demonstrates that an intention to lean the body forward leads to a smaller braking impulse and a higher step frequency through shorter support and flight times and a smaller vertical impulse during the initial part of the acceleration phase of a sprint.