I was just noticing that there are never kids outside these days. When I was a kid I was always outside and so were my friends. We'd be gone for hours playing outside, adventuring the desert, riding bikes, swimming and building forts.
When I was growing up, we knew all our neighbors, and there was only one fenced-in yard (and the kid who lived there wasn't allowed outside his yard to play -- he was considered "the weird kid" because of it). Kids did go outside to play, and there was a schoolyard real close by.
In our neighborhood we're only now, after five years living there, beginning to meet some of our neighbors. I don't get home at night until 6:00 or so. Weekends are busy doing errands. Play has to be "scheduled" with the neighbor kids, because of conflicts with sports, classes, and family events.
Now granted, Gem is just turning five, so it's not that big a deal as yet. But she's already decided it's not as much fun to swing on her swingset by herself in our (fenced-in) backyard than it is to play with others. But she's still much more interested in playing outside than in sitting in front of the TV. The fact that we have a pool is a big plus for outside-play during warm weather. And i'm hopeful that it will be a draw for friends, too.
Much of it is food as well, I think. Soda was a couple-times-a-YEAR treat for me growing up, not a weekly or daily thing. Going out to McDonalds was a family event, not a drive-through mainstay. My mother never dreamed of giving me candy for doing a good job at my schoolwork, but Gem's grandmother rewards her with food sometimes. The dirt-cheap abundance of high-fat, high-sugar treats is ubiquitous.
Every generation has its trials to face. One of ours is raising our children healthily, without obsessing over what they eat and how much they exercise.