I like the way my daughters school goes about it they have after school programs that promote physical fitness. My daughter takes the zumba class and loves it. They use it as a alternative to the latch key program and it is free. It is 3 days a week and they do sports and dance in all they have about 12 different programs. It is different then the school sports because they focus more on the physical then if you are good or not. The teachers set it up and stay after to do the different programs.
Although my daughter does eat healthy and is active she isn't skinny. Her dr has no concern about her weight, but she is a bigger girl. She is tall and all the females on her dads side of the family are just bigger people. It is easy to sit back and say parents don't care or they just feed there kids junk and sit them in front of the TV, but honestly that isn't always the reason. Some kids have health issues. Some parents have health issues. Just like anything else it is easier to sit back and judge a group of people when you don't have the issue in your own household. I don't think "fat letters" are the answer, but to say parents just don't care is kinda offensive. Some parents do care and just don't know what to do I have seen it. A lot of parents don't have the money to get their children into after school programs. Some don't live in neighborhoods where you can just let your kids go out and play. Some parents have to work many hrs just to get food on the table and to buy the necessities.
I have actually talked to parents of obese children sense my daughter started this program. I have seen some people just not know what to do. There are children of all ages and sizes there. I have also seen parents of skinny kids who feed their kids nothing but junk and sit them in front of the TV. Skinny/fat doesn't always show the health of a child and it doesn't always show the involvement of the parent.