specialized sports. where do you cross the line? >> unstructured will lead to less of the overuse type injuries we see. it's not until you introduce a parent or coach into the activity that it leads to the overuse type activities. >> it's one thing to encourage babies to stretch and roll. toddler sports training is extreme parenting for kids who may not be ready. >> go to the playground. climb the monkey bars with your children. i used to do pull ups and sit ups. that's what the kids need. >> it includes unstructured physical activity, not training is what's best. tell that to a thriving gym full of 2 and 3-year-olds. i understand there are skep tims and concerns. every good thing can be done in a harmful way. the fear of that should not keep us from doing the good things