Is it true that you have to keep your feet planted in one place while you play the game?
Also, there was a recent article written exactly on this subject.
http://www.psxextreme.com/feature/669.html
Excerpt:
Gaming and exercising can co-exist
It's actually a lot easier than you think. Say you game for an average of 3 hours a day. Take 1 of those hours away and spend that time bettering yourself...not difficult. Also, when Aristotle extolled the virtues of...well, virtue, he was talking about balance. The middle is where you want to be; i.e., if you spent a few days playing many hours of the latest big game, you can compensate by laying off for a few days and focusing on health. It's best to get into a give-and-take routine with your body, though. Lastly, diets are pointless. You need to change the way you live and it needs to be permanent, and the only way to do it properly is the natural way.
It can take time. You'll get sore. You'll sweat and be uncomfortable. But believe it or not, it won't take long before you'll want to do it, because your body craves it. I feel like crap if I miss a rowing session, and it annoys me when I miss a weightlifting session. You don't have to do what I do (5-6 days a week, about an hour a day). You really don't. Just about any effort, provided it's a continual effort, pays off.