The purpose of this research was to prove through a case study, the effect of a training program for arousal control, through breathing techniques and biofeedback, on the athletic performance and self efficacy on the putting of 4 children golfers. A within subject, unique case experimental design was performed in two phases. One base-line phase, where the individual zone of optimal function (IZOF) of each athlete was determined, and a second phase of intervention, consisted in 16 sesions of 20 minutes each one, based on breathing techniques and biofeedback, the athletes were taught to reach and maintain their previously determined IZOF, for the improvement of their performance. The results demonstrated the effectiveness of intervention in the two variables studied, especially in three of the four subjects.