Rhythmic Gymnastics is a sport that requires high-difficulty motor skills and perfect execution. The body is considered as a yoga and mind therapy that for many researchers influences the improvement of sports performance. In this work we analyze the effect of a Yoga training on sports performance and the psychological variables related to it. Thirty gymnasts between the ages of 11 and 16 participated, doing a weekly Yoga session for 5 months, in addition to the Rhythmic Gymnastics training. We analyze the changes in performance and in the psychological variables studied before and after the intervention. The results obtained indicate a significant improvement in both parameters. Conclusions: the gymnasts participating in our study significantly improve their performance after the intervention, which may suggest, without generalizing, the advantages of including a yoga exercise program in their preparation.