Video Games in Gym Class - DDR 101?

Saige writes: "When I was in school, gym class was basketball, running laps, and icky locker rooms. Today, kids get to play video games - and get credit for them! No, it is not as bad as it seems. Apparently, someone has become clued in that Dance Dance Revolution promotes physical activity, and a school in California is making use of that. Can I go back and retake gym?"