I can’t disagree with that. But being on the playground is not going to protect them from measles, mumps, polio, pertussis, tetanus or any of the others. In fact, it probably makes exposure greater.You wanna make kids healthier? Get them off those damn cell phones and out in the back yard. Play wiffle ball, football, basketball, baseball (if there's a diamond close), etc. Kids are full of energy. It's healthy to burn it off. And feed them!