فهرست نشریات علمی دسترسی آزاد ایران

Abstract: Backpacking has become a habit among people from preschool to college and even beyond. But unfortunately, the appearance of the bags is more important than their efficiency.The motor activities of children and adolescents are of special importance because they go through the period of physical development with greater speed and adaptation. In the meantime, carrying a backpack should be given special attention due to its prevalence and prevalence, because various studies indicate its negative consequences.