Obesity is one of the leading health complications in the world, one of the most serious public health challenges of the 21st century it effect on every system of human body, locomotory system. The present study is a quantitative study, which was designed to investigate the effect of obesity on different body joints in obese & non-obese females aged between 12-14 years. The whole sample consisted of 50 subjects with equal number of obese (50) and non-obese (50) females. The subjects were instructed to run across a pre-designed walkway at their maximum speeds. During this, they were filmed using high-resolution cameras. The criterion measures of interest were different joint angles of lower extermities. Conclusion: significant difference was found in selected body joint angles between obese and non-obese females of same age category. Obese female have higher joint angel than non obeses female in all selected joints angles.