Context: The Bent leg raise (BLR) technique was given by Dr. Brian mulligan and is an excellent technique which is used to improve flexibility of hamstring muscle. The intention of this technique is to restore normal mobility and reduce physical impairment. Aim: To find out an immediate effect of Bent Leg Raise (BLR) Technique in school going children with hamstring tightness Setting and design: The experimental study was carried out in various primary schools of Abu road. Method and material: BLR technique was given to 70 subjects, aged 5–12years. Also, the inclusion and exclusion criteria were taken into consideration. Statistical analysis: Data was analyzed by using SPSS Version 20. Wilcoxon signed–rank test was used for the pre treatment and post treatment comparison of active knee extension (AKE) within the group. Results: Statistically there is significant (p<0.05) effect of BLR technique in school going children with hamstring tightness. Conclusion: There is significant effect of BLR technique in school going children with hamstring tightness. Therefore, BLR technique can be used with conventional techniques to improve hamstring flexibility in school going children