Students exercise with Dance Dance Revolution.

Byline: Annie Mccallum

Mar. 8--Students at Linkhorne Elementary School are busting a move to burn calories in a new after-school program that uses a dance video game to promote exercise. Twice a week, 20 select fourth- and fifth-grade students come to the gym to play Dance Dance Revolution, an interactive video game. "It's like a video game, but the control panel, you use your feet," said fourth-grader Edward Austin. Edward admitted he's "kind of good" at the game and enjoys it. Before the music fills the gym, a voice from the game booms, "Are you ready?" Austin shouts, "Here we go!" Arrows on a large screen at the front of the gym choreograph …