EN
The objective of this study is to analyze the effectiveness of a program of intervention among coaches and athletes; to evaluate attitudes in favor of fun and fair play in sports and, on the other hand, hard play, gamesmanship, the need for victory and cheating as attitudes that go against prosocial behaviors. The sample includes football teams with a total of 636 young athletes (615 boys and 21 girls) with an average age of 12.50 years and an age range between 10-16 years in the juvenile, infant and cadet categories during the season 2016-2017. An adapted version of the Spanish Questionnaire for Fair Play Proceedings (EAF) was administered at two different times. The results show that young athletes value sport positively as fun at two moments of the season. The program was shown to be effective, although not significantly, in terms of a decrease in the values of gamesmanship, cheating and victory between the first moment and later moments in the program. Hard play, on the other hand, did not present an improvement in the program.