The purpose of the study was development of norms for Flexibility of 13 years old girls of Delhi Schools. The Selected Subjects for the contemporary study were 700 School going girls of the age group 13 years from various schools of Delhi. The Sources of the Subjects were the Schools selected from all 29 zones of Delhi. The variable measured was Flexibility with the help of Flexomeasure. The test item was Sit and Reach test which was conducted on each subject for collection of data with prior consent obtained from the School Administration. The Statistical Techniques included Descriptive Statistics in which mean, Standard Deviation, minimum, maximum values and range was applied. Percentile was applied for development of Norms. The Study concluded that the Norms under Percentile Scale of Flexibility (in centimeters) for girls aged 13 years old studying in Delhi Schools were categorized into 5 categories namely Excellent, good, Average, Fair and poor. The Study revealed that the Scores below 23, 23-28, 29-31, 32-36 and above 36 cms scores in flexibility are considered as poor, fair, average, good and excellent scores respectively for girls aged 13 years studying in Delhi schools.