The purpose of the study was to clarify the Influence of 6 week selected upper body exercises on the performance of backstroke in swimming.Thirty boys swimmers (age =14 to 16 years) were randomly assigned to the experimental group (n=15) and control group (n=15). All swimmer was selected from Panchal high school, Panchal, Bankura West Bengal. Upper body exercises were included in the experimental group training session 5 times (each session 30 minutes) per week over 6 weeks as part of their usual weekly training regime. Both groups of swimmers were tested backstroke swimming before and after training. Backstroke swimming performance were tested and measured through standard procedure with the help of expert and under the direct supervision of the experimenter.For the analysis of data statistical mean, standard deviation and T-test was used. The level of significance was set at 0.05 levels. In conclusion, there was a significant effect of upper body exercise on backstroke performance of experimental group.