Sports in school: yes or no?

Physical Education is very discussed as a school subject. In some countries, like in China, it is considered to be less important than academic subjects; in other countries it is held as a relevant part of school life, as in the United States of America.
One of the main arguments against Physical Education being taught is the time it subtracts to other activities, like technical and literary subjects. Furthermore, in such a globalised world there is growing competition, which demands much more academic competencies to our children. However, many studies have provided strong evidence for physical activity as an enhancer of school performances, as the old motto "mens sana in corpore sano" stated. Also, sports are proved to be a very effective way to reduce stress, helping concentration and improving mental health.
Those who support the unimportance of physical activity in school affirm that parents should be responsible of their children exercise. Whereas, facts show that at home children usually are sedentary, above all for what girls are concerned: only ten percent of girls spend more than three hours a week in a physical activity. Furthermore, sometimes youngsters don't even have safe places where to play, whereas schools are generally fenced and controlled.
Another argument against Physical Education is that some children don't like it. Otherwise, others may find their future in physical activity. Besides, games are one of the best ways to learn, and many soft skills and social rules can be learnt while playing sports.
In summary, many people think that Physical Education shouldn't be taught in school or that it should at least be reduced as other subjects are more important for future life. However, exercise not only helps studying but it also teaches some soft skills useful for future life. I personally believe that it is important not to leave sports out of the educational system.