Want teenagers to be more active? Just talk to them first
Dog walking has health benefits for children - but it's not a straightforward fitness boost.
Kids' fitness has declined for several decades, but kids in rich countries are showing improvement. What does this suggest for kids in poor countries?
Girls in primary school are just as physically capable as their male classmates, our research shows.
Kids in the U.S. are not as fit as we might think, based on our the success of our athletic superstars. Why do we lag? It might have to do with inequality.