The participants were 18 boys, aged between 8 and 11 years, divided into E and E+D groups according to the program they followed. The E group followed a physical exercise program (three 90-minute sessions/ week), and the E+D group the same physical exercise program plus a low calorie diet. Physical fitness was assessed by the European physical fitness test battery including flamingo balance, plate tapping, sit-andreach, standing broad jump, hand-grip strength, sit-ups, bent-arm hang, 10 × 5-metre shuttle run, and 20-metre endurance shuttle run. The Kruskal-Wallis test was applied to reveal overall intergroup differences (E and E+D groups), and measurements showing significant differences were further analysed for differences between individual groups by the Mann-Whitney U test.