CNN: CDC: Most still don't get enough exercise
It doesn't seem like that interesting of an article, just going on about how you should get thirty minutes of moderate activity at least four days a week.
The interesting bit is buried under the "Going Light" header. It mentions that one hour of light activity is equivalent to thirty minutes of moderate activity. Light activities include:making photocopies, playing video games, coloring, sitting in a whirlpool bath, floating and "purposeless wandering."
So, just play video games for an hour a day, four days a week and you're fine!