"mens sana in corpore sano" - a healthy mind in a healthy body. As the old latin proverb states physical fitness is directly linked to cognitive abilities.
Current research in the field of neurobiologie proves this intuition. Sports and physical activites are proven to increase brain function and learning capabilities. Moreover teaching children the importance of physical activity helps to prevent adult obesity and orthopedic problems.
But most importantly doing sports together is lots of fun and helps the children to bond.