worry about pushing kids into specialized sports too soon. >> we are seeing injuries in younger children we had never seen before. we're seeing overuse injuries which were exclusive to adults and now in 7, 8-year-olds. the government now classifies more than 10% of preschool age children as obese. >> swing forward. then on the blue. right backing. >> everyone agrees kids need to be more active. it's the how that's the question. there's organic play and then there's specialized sports. where do you cross the line? >> unstructured activity is probably had lead to less of these overuse type injuries that we see. it's not until you introduce a parent or a coach into the activity that it leads to these overuse type injuries. >> it's one thing to encourage babies to stretch and roll, say psychologists like wendy walsh, but toddler sports training is extreme parenting she says, entirely for kids who may not be ready you. >> want to be a good parent? go to the playground. lime the monkey bars with your kids. you can get in shape with them. i used to do pullups on the bars