How do you encourage children to put down their tablets and ipads and play outside instead? I want them to be able to enjoy the street games we used to play when we were children, like tumbang preso, langit lupa, etc.

Let him have friends outside. That's the quickest trick. In our neighborhood, there are a lot of kids so it's not really a problem for us to have the kids go outside and play. Just make sure to keep a good eye on your child all the time as peer pressure is such a great influence among kids.