 Nutritional status may be important in achieving optimal physical performance. There is evidence of significant improvements in physical fitness, aerobic capacity and anaerobic threshold of children and adolescents with nutritional intervention, albeit in children with initial sub-optimal nutritional status. This may be of particular relevance in developing countries like India, where there is limited data on physical fitness and a wide-spread prevalence of concurrent micronutrient deficiencies even in apparently normal school age children. The present study therefore, is designed to assess the effect of a nutritional supplement on the physical performance measures of school going children. This is a randomized, double blind placebo-controlled study of three treatment groups 1 test, 1 positive control placebo and 1 no intervention conducted in equal numbers of male or female children ages 7-11 attending day schools in Bangalore. Subjects in the intervention test and positive control groups will receive study treatments fortified or un-fortified nutritional powder once a day for 4 months. The treatments will be administered under supervision on all school working days; for the weekend and other holidays, sachets will be provided for home consumption. At baseline and 4months, physical performance tests will be administered and blood sample drawn to assess nutritional status. Other selected outcome measures such as nutrition status and muscle strength endurance will also be assessed. It is hypothesized that after 4 months of intervention, children consuming fortified nutritional powder will have statistically significant improvements in physical performance fitness measures as compared to the two control groups. 