The aim of the study was to analyze the effect of shoulder strength and abdominal strength of school students after different durations of warming up. For the purpose of this study 20 school students were selected for this study. The schedule of different durations of warming up was prepared by researcher which included 15 minutes, 20 minutes and 25 minutes warming- up exercises on different days of week just after warming up the data was collected by administrating pull ups for shoulder strength and bent knee sit-ups for abdominal strength. The level of significance was set at 0.05 level to check the shoulder strength and abdominal strength of subjects. The one way ANOVA was applied as statistical procedure. There was no significant effect found on shoulder strength and abdominal strength of school students after different durations of warming up.