Aim: The aim of this study was to investigate the relationship between body composition and physical activity level in the young adults. Materials and Methods: 62 student with no history of cardiopulmonary, orthopedic, rheumatic or metabolic diseas in last 6 months were participate in the study. Their demographic and physical characteristics were recorded. The physical activity levels were determined by FIT score. Body mass index and fat tissue measurements with skinfold caliper, body fat percentage, and ideal weight were calculated by special formulas. Results: Participant’s FIT score was found 27,08±18,74. There was no perfect FIT score. There wasn’t statistically significant difference between males’ (27±18,55) and females’ (27,08±18,74) physical activity levels (p=0,936). The males' body mass index (24,92±3,15 kg/m2 ) were higher than the females’s (21,23±3,18 kg/m2 ) (p=0,004). The females’ body fat percentage (22,74±6,93%) was found higher than the males’ (16,60±5,46%) (p=0,003). There wasn’t statistically significant difference between males’ percentage of overweight (0,06±0,11) and females’ percentage of overweight (0,05±0,12), (p=0,804) There wasn’t significant relation between physical activity and body mass index in females (p=0,055) but there were significantly positive correlation between physical activity, body mass index (rs=0,662, p=0,007), the ideal body weight (rs=0,544, p=0,036), body fat percentage (rs=0,602, p=0,018) and overweight percentage (rs=0,602, p=0,018) in males. Conclusion: The low physical activity level, however, their normal body mass index can be explained by conducting the experiment coming young population. Young adults’ body compositions are healtly that is something good. However, they should be encouraged to engage with more physical activity.