Interactive entertainment enthusiasts who abhor exercise are suddenly receiving a well-deserved kick in the gluteus maximus, courtesy of Powergrid Fitness kiloWatt peripheral, the first controller that actually helps couch potatoes build arm strength while playing video games. When you push on the shoulder-height contraption, sensors in the handgrips translate the force into in-game motion. Best used in conjunction with racing simulations, the harder you shove, the faster virtual roadsters go. Recent findings from the American College of Sports Medicine prove it stimulates muscle development — not just sore thumbs. $699, compatible with PC, PlayStation2, GameCube, and XBox systems.