Why is there a growming concern over the physical fitness of children and adolescents

Well it's obvious the society nowadays is becoming complicated day by day. children have many things to do now, a few years back everybody in college used to play football or maybe they went to a gym class... I think mainly its because many people did not have much to do compared to know the internet error has taken over and our teenagers just think about Facebook or watching youtube videos the whole day dwindling the physical fitness and other sports that make children grow mentally emotionally and physically.

Bis the answer hope i