levels of physical activity decline with age and gender during adolescence. After the age of 13,4 girls are significantly less active than boys.5, 6, 7 In Thailand, 82.2% of boys, 12 to 14 years of age, generally perform more physical activity, compared to 80.9% of girls. Similarly, 78.6% of boys, 15 to 19 years of age, participate in physical activity compared to 59.3% of girls, in Thailand