I'm not quite as convinced as you are that the government wants us physically fit and off the couch. I believe it's the opposite. They want our fat lazy asses right there on that couch shoving cheesy poofs down our throats while we digest their corporate news and distract ourselves with American Idol.
Maybe not, but government is driven by voters. Once you're footing the bill for your neighbors bad health habits, it'll be a compelling argument to pass laws forcing him to get off his fat ass and down to the gym.
Rather than derail this thread, I started another on this topic:
http://www.usmessageboard.com/politics/206719-totalitarian-government-happens.html#post4768090