The primary aim of the study was to analyze the effect of various durations of warming up on performance of agility of school students. For the purpose of this study 20 school students were selected as subject of the study. The data were collected by administrating shuttle run test for agility The shuttle run were administered consecutively on three days preceded 10 minutes warm up on the first day 15 minutes warm up on the second day and 20 minutes warm up on the third day. The level of significance was set at 0.05 level to check the fitness of subject. The one way ANOVA was applied as statistical procedure. There was no significant difference found between different durations of warming up on agility of school students.