Poor physical fitness; as well as obesity; are risk factors for some sever disease insulinresistance; type 2 diabetes mellitus; inflammation and cardiovascular disease. Therefore thepurpose of this study was to survey the effects of obesity; overweight; normal and under-weighton physical fitness and comparison this factors in young man and women collegian student.Material and methods: 149 students was selected from Payamenor university of Boshehr cityand divided into an obese and overweight; normal weight and underweight groups based onbody mass index. T independent test were used for analyses of data in two groups. SPSSsoftware version 16 was used for analyses of data at levels of α<0.05.Obese young man and women had poorer performances on all tests requiring propulsion of thebody mass. Other results indicate; mean of physical fitness tests was higher in underweightstudents. There are a significant differences in all test (540 meter (p<0.001); 4×9 meter run(p<0.001); sit-up test (p<0.001) and push up test (p<0.001) and vertical jump (p<0.001)between young man and women. Overweight/obese students had poorer performance incardiovascular endurance; agility and power of lower limb than non-obese subjects. Results ofthis study show that young women have lower scores on all fitness components.