We all assume it, but science has finally proven it.
A recent Australian study has qualified the health affects for children who spend too much time in front of television and computers. Children who are spending more than two hours per day in front of either the television or a computer have been shown to be significantly less fit. Additionally, they also found this couch potato approach more severely affected girls than boys.

So no longer do the mums and dads of Australia have to tell the kids that sitting in front of television is lazy, they can now tell them that they will be less fit as a result.

