The days before Pong, where you went outside and played in the grass mud and dirt, not worrying about all the BS people are concerned with these days. Kids were generally healthier. I see too many kids all pasty and frail from a life of video games and Hot Pockets, hardly setting foot outside for long periods of time. It's not natural. Good growth of muscle and bone structure starts at early ages, and if you don't build a solid foundation for a healthy lifestyle early on, you'll have a synergistic effect as time goes on and you grow older. Atrophy sets in quicker and you're more prone to disease and illnesses. The "play for an hour a day" campaign is a good idea and a kind of compromise to meet children in the middle with all the options set before them with today's technology, but imho kids need more exercise than just an hour. Basically, what I'm trying to say is: Gtfo the house ya little brats.
...and in summation: