Jurnal Gizi dan Kesehatan 96 THE CORRELATION BETWEEN PERCENT BODY FAT AND IRON INTAKE WITH PHYSICAL FITNESS OF THE ADOLESCENTS IN VOCATIONAL SCHOOL WIDYA PRAJA UNGARAN Indah Suciani, Sugeng Maryanto, Indri Mulyasari Nutrition Science Program, Faculty of Health Sciences, Ngudi Waluyo University Suchypsinaga@gmail.com ABSTRACT Background: Physical fitness at adolescents work decreases every year. Physical fitness is an important health indicator for adolescents because it can predict health impact and is associated with improved health status. Excess body fat percentage and less iron intake are the factors that can affect physical fitness in adolescents. Objective: To know the correlation between percent body fat and iron intake with physical fitness of the adolescents in deviation Widya Praja Ungaran. Methods: The type of this study was a correlational study using cross sectional approach in Vocational School Widya Praja Ungaran. The samples of 122 students ware taken by total sampling method. Percent body fat was measured by using BIA Hand to Foot electrode, iron intake by using semiquantitative FFQ. Physical fitness was measured using a Multistage fitness test. Data analysis used Spearman Rank correlation test (α = 0,05). Results: Average body fat percentage of the respondent was 19.73% ± 7.28%. The average iron intake of the respondent was compared of daily requirement was 47,27% ± 31,49%. The average physical fitness was 26,74 ml/kg/minute ± 6 ml/kg/minute. There was a correlation between body fat percent and iron intake with physical fitness (p = 0.0001, p = 0.0001) Conclusion: There is a correlation between body fat percentage and iron intake with physical fitness of adolescents at Vocational School Widya Praja Ungaran. Keywords: percent body fat, iron intake, physical fitness.