Weight is only part of the health equation. There is exercise too. We try to make sure the boys run around outside a lot. Having a trampoline helps because kids love to bounce and they play sports as well. DH is an avid wrestler and back-yard footy player for which I am very grateful.
If you eat wholesome food most meals and get plenty of exercise then you'll probably be doing ok in the blood pressure, heart health, cholesterol, functional fitness areas even if you aren't built like a supermodel.