Kids and teens are getting sick from lack of exercise and outdoor play, says Dr. Dan O'Neill, an orthopedic surgeon, sports psychologist and author of "Survival of the Fit." Screen time and processed foods are the culprit. Twenty percent of kids are obese and many of them are suffering from ailments like diabetes, pre-diabetes, high blood pressure and high cholesterol--adult illnesses.What can parents do to keep their kids healthy?