The aim of this study was to analyze the effect of a 12 weeks program based on stretching and muscle strengthening in a group of 30 non-elite gymnasts, young Rhythmic Gymnastics (RG) (8.37 ± 1.81 years). Thus, to prevent Lumbar Hyperlordosis (LHL) and its associated pathologies: Low Back Pain (LBP). Control group continued with their regular RG training. Lordosis curve was assessed through the Sagittal Arrow’s Test before and after intervention. In the same way, gymnasts were interviewed about their LBP incidence. Lordosis curve was reduced significantly after intervention (p < 0.05) and LBP incidence decreased a 33.3%. A relationship between lordosis curve level and LBP incidence was not found. As a result, program's effect size was small. We encourage to continue applying this kind of initiatives in RG training.