A new study shows that a child’s physical fitness is related to his or her concentration and health-related quality of life. In the study, published in the Journal of Clinical Medicine, German researchers studied over 6500 boys and girls. They found the higher the level of children’s physical fitness, the better they can concentrate and the higher their health-related quality of life. On the other hand, overweight and obese children had significantly worse physical fitness, which proved to be associated with poorer health-related quality of life, self-esteem, and well-being in friendships and at school. This study suggests that if parents encourage their kids to become more physically fit, they might become more mentally fit too.