Gaming healthy?

My husband is trying to talk me into buying our son a PS3 or a Wii. He says that games today aren't all about flopping down in front of the television for hours and never moving. He says we could buy a selection of "healthy" games for our son to play that would encourage him to get up and move around more than he does now. I think I need to see one of these "healthy" games in action before I am totally convinced but I am at least considering his idea for now.